Christophine and Christophina- feminine variations of [name_m]Christopher[/name_m]
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Deseret, [name_f]Dezeret[/name_f] is listed as a [name_m]French[/name_m] variation of [name_f]Desiree[/name_f]. However Deseret is at time used in the US by members of the church of [name_m]Jesus[/name_m] [name_m]Christ[/name_m], meaning honeybee.
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Menestho (f): The name of an Oceanid in Greek mythology, Menestho is of Greek origin and means “swift-force”.
Menippe (f): The name of several figures from Greek mythology, Menippe is of Greek origin and means “the courageous mare” or “sipper”.
Mentis (u): A Latin word meaning “having sound mind”. I can’t remember quite where, but I think this may have also been the name of a figure in Greek or [name_m]Roman[/name_m] mythology.
Mopsopia (f): The name of a lesser-known Oceanid in Greek mythology. Not much information on her name is available.
Asllan (m): A name of Turkish origin meaning “lion”. A variant of [name_m]Aslan[/name_m].
Ariadni (f): [name_m]An[/name_m] alternate spelling of [name_f]Ariadne[/name_f].
Elmslie (u): A surname name of Old [name_f]English[/name_f] origin meaning “elm clearing”. Would fit in well these days, given the popularity of the —lie/lee/ley/ly/leigh ending. Possible spelling variants include Elmsley / Elmsly / Elmslee / Elmsleigh.
Luigio (m): A less common form of [name_m]Luigi[/name_m], Luigio is of Italian origin and means “renowned warrior”.
Tunis (u): A place name of Arabic origin meaning “camp” or “stop”, the capital of Tunisia. Also a [name_m]Dutch[/name_m] surname, a variant of the personal name Teunis, which in turn is a vernacular form of [name_m]Antonius[/name_m].
Kincso (f): A variant of the Hungarian name [name_f]Kincső[/name_f].
Polyniki and Polynike (f): Names of Greek origin meaning “many victories”.
Rutherfurd (m): A variant of [name_m]Rutherford[/name_m].
Whittet (m): A Scottish surname name meaning “white haired”. It is a variant of the surname Whitehead.
Zasha (u): A name of Russian origin meaning “defender of the people”. It is derived from the name [name_m]Aleksandr[/name_m] and is very likely related to the more common [name_f]Sasha[/name_f].
Wandalhar, Wandelhar, Wandalher, and Wandelher (m): Rare and obscure [name_m]German[/name_m] names. Not much information is available regarding them, unfortunately.
Vandalar (m): A variant of the name Wandalhar.
Vandalarius (m): A Latinized version of the name Vandalar.
Satie (f): Possibly a variant of [name_f]Sadie[/name_f] or the Sanskrit name [name_f]Sati[/name_f]. Also the surname of [name_m]French[/name_m] composer [name_m]Eric[/name_m] [name_m]Alfred[/name_m] [name_f]Leslie[/name_f] Satie.
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Ego (f) – A feminine Igbo name meaning ‘money’ or ‘wealth’. It’s pronounced eh-go/ay-go (not like the [name_f]English[/name_f] word ‘ego’). A famous bearer is American actress/comedian and [name_m]Saturday[/name_m] [name_m]Night[/name_m] [name_f]Live[/name_f] cast member Ego Nwodim, as well as Nigerian actress Ego Nwosu. It can be short for Egobunma (which is Ego Nwodim’s full name), Adaego, or Nwakaego (and likely other names as well, but these are the only three I’ve come across).
Egobunma (f) – Igbo name of uncertain meaning, the full name of actress/comedian Ego Nwodim.
Adaego (f) – Igbo name meaning “daughter of wealth” or “daughter of money”.
Nwakaego (f) – Igbo name meaning “the child surpasses wealth” or “the child surpasses money”
Deepika / Dipika (f) – feminine name used in Hindi, Marathi, Tamil, Telugu, and other languages on the [name_f]Indian[/name_f] subcontinent, from Sanskrit roots meaning “light” or “lamp”. It is related to the masculine name [name_m]Deepak[/name_m]. Deepika Padukone is a famous bearer – she is India’s highest-paid actress and has been named one of Time Magazine’s 100 Most Influential People.
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Kaliane (f)
origin: Cambodian, meaning “darling”
notable people: Kaliane [name_m]Bradley[/name_m], author
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Back with more long lost rarities. 
(All of these were found on birth, marriage, death and/or census records from the 1830-1960 time range, by the way!)
Roselda (f) - one of the many elaborations of [name_f]Rose[/name_f], Roselda may have been inspired by names such as [name_f]Zelda[/name_f] or [name_f]Elda[/name_f].
Dellaphine (f) - most likely an elaboration of [name_f]Della[/name_f] influenced by [name_f]Delphine[/name_f].
Silvander (m) - derived from Latin silva meaning “forest, wood” and Greek ἀνήρ (aner) meaning “man”. It was used (and may have been invented) by English playwright [name_m]Thomas[/name_m] Killigrew for his play Claricilla. The French form (which can be spelled as either Silvandre or Sylvandre) is mentioned in La Confidence naïve (or simply La Confidence), an anonymous 18th century poem which later became the basis for Ah! Vous dirai-je, maman, a well-known nursery rhyme sharing its melody with Twinkle, Twinkle, Little Star.
Mycroft (m) - transferred use of a surname (of which the first element is uncertain, the second is Old English croft meaning “enclosed field”). A famous fictional bearer is Mycroft Holmes, brother to [name_m]Sherlock[/name_m].
Isoline (f) - French form of Isolina (also missing from the database!), a diminutive form of [name_f]Isola[/name_f]. A rather amusing pop culture association is Isoline-Isolin, a gender-bending text from Catulle Mendès’ subversive fairy tales collection Les Oiseaux bleus; [name_m]André[/name_m] Messager’s opera Isoline tells roughly the same story. Isolin is the masculine form, as you may have guessed.
Ortrud and Ortrude (f) - derived from the Germanic elements ort “point (of a sword)” and thrud “strength”. A known bearer of this name was princess Ortrud of Schleswig-Holstein-Sonderburg-Glücksburg (1925-1980).
Derelys (f) - of unclear origins; it was the stage name of Derelys (born [name_f]Geraldine[/name_f]) Perdue, a silent era film actress. Miss Perdue inspired a few namesakes in the 1920’s.
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Utterly obsessed 
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So am I! 
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Ognyan (m) is a Bulgarian name meaning “fiery”, pronounced og-NYAHN with a hard G!
Stoyan (m) is a Bulgarian name meaning “to stand”, pronounced sto-YAHN. Stojan is the Serbian, Croatian & Slovene variant, pronounced STOY-ahn. The feminine variants of the name are Stoyanka (Bulgarian, pn. sto-YAHN-kah) & Stojanka (the 3 other origins I mentioned, pn. STO-yahn-kah)
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Romeu- Portuguese form of [name_m]Romeo[/name_m], pronounced roo-MEW
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màili ( prounced MAH-lee ) - scottish gaelic name equivalent to the english name molly.
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Stoimen (m) is a Bulgarian name, literally meaning “a hundred names”. It was traditionally chosen by families that had recently lost children. The intention was that since the child had “a hundred names”, the evil spirits or demons wouldn’t know his true name to be able to get to him and result in his death. It’s pronounced sto-EE-mehn and is considered quite old-fashioned nowadays.
Minas (m) is a Greek name of uncertain origin. It may come as a variant of the name of the Egyptian god Min / Menas, a god of fertility and harvest. It may also come from the Greek word meno, meaning “to message, to notify”, the ancient Greek mene, meaning “moon”, or menis, meaning “wrath”. It’s pronounced mee-NAHS.
Penka (f) is a Bulgarian name, originating as a diminutive of the Bulgarian feminine form of Peter, Petra (so it has the meaning of “rock, stone”). In various studies over the years (I was able to find a 2006 & a 2016 one) it has been among the top 20 most common Bulgarian girl names. It’s pronounced PEHN-kah.
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Alin (m) is a Romanian name of uncertain origin; most likely a masculine form of Alina (which on Nameberry is listed with the meaning of “bright, beautiful; noble; delicate, soft; defending men”) or inspired by the Romanian word alina meaning “to soothe, to ease”. While it may look like a spelling variant of Alan, it’s actually pronounced with an emphasis on the second syllable, like ah-LEEN.
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Tetyana (f) is a Ukrainian form of [name_f]Tatiana[/name_f], pronounced teh-TYAH-nah
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Chryses (m): In Greek mythology, Chryses was a priest of [name_m]Apollo[/name_m] during the Trojan War. His name is of Greek origin and means “golden”.
Thoas (m): The name of several figures from Greek mythology, Thoas is of Greek origin and means “fleet, swift”.
Astynome (f): The name of several figures from Greek mythology, Astynome is of Greek origin and seems to have an unknown meaning. It was the real name of Chryseis, the daughter of Chryses who was kidnapped during the Trojan War.
Rhesus (m): The name of two separate figures from Greek mythology, Rhesus’ meaning is unknown. However, it also qualifies as an animal name because of the Rhesus macaque, a species of monkey.
Hyginus (m): The name of a Latin writer, Hyginus Gromaticus, Hyginus is of Latin origin and may mean “healthy”.
Eetion and Eëtion (m): The name of several figures from Greek mythology, Eetion and its variant Eëtion are of Greek origin and has no obvious meaning.
Peleus (m): The father of [name_m]Achilles[/name_m] in Greek mythology, Peleus is of Greek origin and may mean “clay”.
Palamedes and Palomides (m): The name of both a figure from Greek mythology and a figure from Arthurian legend, Palamedes is likely of Greek origin and may mean “knight”. Palomides is a spelling variant sometimes used for the figure from Arthurian legend.
Briseus and Brises (m): The father of [name_f]Briseis[/name_f] in Greek mythology, Briseus is of Greek origin and has an unknown meaning. Brises is an alternative name sometimes used.
Chryseida and Criseida (f): Two names derived from the Greek name Chryseis, which may mean “golden”. They may also be related to the name [name_f]Cressida[/name_f].
Criseyde and Cresseyde (f): Variations of the name [name_f]Cressida[/name_f].
Huberd (m): A patronymic surname of [name_m]Dutch[/name_m] and [name_m]German[/name_m] origin, Huberd is a variant of [name_m]Hubert[/name_m].
Cutberd (m): Most likely a variant of the name [name_m]Cuthbert[/name_m].
Alisandre and [name_f]Alissandre[/name_f] (u): Both of these names are related to the name(s) Alexander/Alexandra and mean “man’s defender”.
Calipsa (f): Very likely a variant of the name [name_f]Calypso[/name_f], though not much information is available.
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Vedran (m) is a Serbian & Croatian name meaning “clear, cheerful”, pronounced VEH-drahn. Its feminine form is Vedrana, pronounced VEH-drah-nah.
Cvetka (f) is a Slovene name meaning “blossom, flower”, pronounced TSVEHT-kah. Cvetko is the masculine equivalent, pronounced TSVYEHT-ko.
Another name with the same floral meaning is Tsveta (f), which is Bulgarian and pronounced TSVEH-tah! Tsveta’s masculine form is Tsvetan, pronounced tsveh-TAHN.
Davor (m) is a Croatian, Serbian & Slovene name of uncertain origin, pronounced DAH-vor. It may have been the name of an old Slavic war god and it inspired the davorija, “a type of lyrical-epic poem set to music, particularly characteristic and common in the period of the Croatian folk and literary revival”. A variant of it is Davorin (pronounced DAH-vo-rin) and the feminine version of it is Davorka (DAH-vor-kah).
Hristo (m) is a Bulgarian name, originating as a short form of Hristofor or Hristiyan, the Bulgarian forms of [name_m]Christopher[/name_m] & [name_m]Christian[/name_m] (which are also missing from the database and could be added!), giving it the meaning of “bearer of Christ” or “Christian”. It’s pronounced KHREES-to and it’s very common in its native Bulgaria! A famous namesake is Hristo Botev, a Bulgarian revolutionary & poet who is considered a national hero.
Aranđel (m) is a rare Serbian name meaning “archangel”, pronounced AH-rahn-jehl. It can be latinised as Arandjel.
Divna (f) is a Serbian name meaning “wonderful”, pronounced DEEV-nah
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Zefiro or Zeffiro (m) is the Italian form of Zephyrus, pronounced DZEH-fee-ro
Rosmina (f) is a name from the Italian opera Giasone, according to one source “the single most popular opera of the 17th century”. It’s likely a variant of Rosmunda or Romina, giving it the meaning of “horse protection” or “a Roman”. It seems to be the most popular in Malaysia & Indonesia, especially with the Rosminah spelling, although I’m not sure where it originated from in that scenario!
Kostyantyn (m) is the Ukrainian form of Constantine, pronounced ko-styan-TEEN
Giove (m) is the Italian name for the god Jupiter, and consequently for the planet too. Pronounced JO-veh
Giasone (m) is the Italian form of Jason, pronounced JAH-zo-neh or jah-ZO-neh
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Cibella (f): [name_f]An[/name_f] alternate spelling of the name [name_f]Sibella[/name_f], which means “prophetess” and is a variant of [name_f]Sibyl[/name_f].
Lamuel (m): [name_f]An[/name_f] alternate spelling of the Hebrew name [name_m]Lemuel[/name_m], which means “devoted to God”.
Livilla (f): The nickname of [name_m]Roman[/name_m] Emperor [name_m]Nero[/name_m] [name_m]Claudius[/name_m] Drusus’ only daughter, Livilla means “little Livia”.
Rufio (m): A derivative of [name_m]Rufus[/name_m], possibly of Spanish origin, which means “red”.
Everallin (f): A name of Scottish origin, whose meaning is unknown. Everallin was a Scottish 3rd century historic figure and is also the name of a minor [name_f]Melusine[/name_f] in the rpg game Genshin Impact.
Illaria (f): A spelling variant of the name [name_f]Ilaria[/name_f].
Romsey (u): [name_f]An[/name_f] [name_f]English[/name_f] place name meaning either “Rūm’s island” or “roomy island”. Rūm, in this case, would be short for a personal name, such as Rūmwald.
Lemir (m): A name of Jewish origin meaning “lamb”.
Lemira (f): The feminine form of Lemir.
Ronah (f): A shortened Anglicized form of the Gaelic name Ó Rónáin, meaning “descendant of Ronan”.
Wix (u): A surname name of [name_f]English[/name_f] origin, Wix is a variant of Wicks. It is also an [name_f]English[/name_f] place name, belonging to a village in [name_m]Essex[/name_m], which is derived from the Old [name_f]English[/name_f] word wic, meaning “dairy farm”. Wix can be and is sometimes used as a first name.
Manger (m): [name_f]An[/name_f] [name_f]English[/name_f], [name_m]Dutch[/name_m], and [name_m]German[/name_m] occupational surname name meaning “a retail trader” and a Norwegian habitational surname possibly meaning “sea gull”. Also a word name meaning “trough” or “feed box”. In the [name_m]Christian[/name_m] religion, the baby [name_m]Jesus[/name_m] was said to have slept in a manger as a newborn, making this an offbeat name for a little boy born around [name_f]Christmas[/name_f].
Asterisk (u): The word name Asterisk is derived from the Greek word asteriskos, which means “little star”. [name_f]An[/name_f] asterisk is a symbol like this *. It is a very rare word name, but has been used a handful of times.
Kezie (f): A variant or nickname for the Scottish McKenzie. Also possibly related to [name_f]Keziah[/name_f] and its nickname [name_f]Kizzie[/name_f].
Madelgarde and Madalgarde (f): Names of Old High [name_m]German[/name_m] or Old [name_m]Saxon[/name_m] origin meaning “council garden”.
DeAnn (f): A variant spelling of [name_f]Deanne[/name_f].
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Francois (m): François without the ç. Its feminine form, Francoise, is in the database, but it is not.
Issobell (f): A spelling variant of Isobel.
Donika (f): A spelling variant of the Slavic Danica, which means “morning star”.
Mihal and Mihál (u): A name of Romansh origin, Migal / Mihál means “who is like God”.
Kendy (f): A nickname for Kendra and other names in that vein. Could also be a smooshed form of Kennedy, though that is merely a guess.
Trevaline (f): Possibly a rare combination of the Welsh Treva (feminine form of Trevor) + the -line suffix. This hypothesis is supported and the name thrust into the spotlight by the case of Trevaline Evans, a 52 year old woman who disappeared in Wales in 1990.
Ukshin (m): A name of Albanian origin possibly meaning “wolf”.
Salai (u): A plant name of Indian origin, the salai tree is an East Indian tree which yields resin that is used as incense and medicine.
Lavenie (f): A variant of Lavenia or Lavinie.
Keza (f): A name of both Rwandan and Hebrew origin. In Rwandan, it means “beautiful” and in Hebrew it means “precious”.
Axular (m): Though not much is known about this name, including its meaning, it may be of Basque origin. However, this is based solely on the fact that Axular was a priest in the Basque town of Sara who later became a mythical figure.
Axylos and Axylus (m): Axylos is of Greek origin and means “without tres”. It was a vast, treeless wasteland in the center of a peninsula in Greek mythology. Axylus was the name of a Trojan soldier during the Trojan War and is most likely the Latinized form of Axylos.
Mary-jo, Mary-Jo, and Mary Jo (f): All variants of the name Maryjo.
León (m): A variant of Leon. Also a place name, as León is a province and a city in Spain.
Jenima (f): A rare variant of Jemima.
Ermengarde, Ermingarde, and Irmingard (f): All variants of the German name Ermengard.
EDIT: @tallemaja brought up some great information about Donika in a post below. Please be sure to check it out.
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Elshanum (f): A name of Hindu or Hebrew (I’m getting mixed results) origin meaning “whom God gave”.
Florynka, Fliorynka, and Florenca (f): Florenca is a name of Albanian origin meaning “flourishing” or “flowering”. Florynka is a Polish variant, as well as the name of a village in Poland. Fliorynka is the Ukrainian version.
Shaleena (f): A name of Sanskrit origin meaning “morality” or “virtue”.
Séaghdha and Seaghdha [shay-uh] or [shad-ah] (u): Names of Irish origin meaning “a majestic man”. I’m not sure which pronunciation is correct, so I included both of the ones I found. As a name on its own, Séaghdha seems to be masculine, but its Anglicized form, Shaylene, is feminine. This leads me to be confused as to whether this name is truly unisex or not.
Shaylene and Shaylena: Shaylene is possibly an Anglicized version of the Irish Seaghdha. It is also a variant of Shailene. Shaylena is, in turn, a variant of Shaylene.
Caylix (f): Possibly related to Calix. Some sites refer to Caylix as being derived from the Greek word kalos, meaning “beautiful”.
Matityah and Mataya (f): Matityah is a name of Hebrew origin meaning “gift of God”. Mataya is derived from Matityah and is a variant of Mattea.
Dearica (f): This appears to be an American invented name, possibly a combination of Dear and Erica or Dear with the -ica suffix.
Lillieas (f): A variant form of Lilias.
Buncombe and Boncomb (m): Buncombe is a habitational surname name of Middle English origin meaning “reed valley”. Boncomb is a variant.
Cramond and Crammond (m): Cramond is a Scottish habitational name derived from the compound Caer Amon meaning “fort on the river”. Crammond is a spelling variant.
Joannet (f): A variant of Joan, Joan + the -net suffix, or a combination of Joan and Janet.
Hariot (u): A spelling variant of Harriot and a spelling variant of Heriot.
Grennan (m): An English nickname for a man with a mustache, meaning “a man with a mustache”. Also a shortened Anglicized form of the Gaelic Ó Grianáin.
Treasurer (m): An occupational word name of English origin meaning “a person in charge of finances”.
Charlia (f): A variant of the name Charlie and possibly a feminine form of Charles.
Erzsebet (f): An Anglicized version of Erzsébet, the Hungarian form of Elizabeth.
Sideris (m): A name of Greek origin meaning “iron”.
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