Is there? Not a female version of [name_m]Thomas[/name_m] because that would be [name_f]Thomasina[/name_f], but just [name_m]Tom[/name_m]?
Also is there a female version of these names:
Todd
Jacob/Jake
Emrys
Liam
Harrison
Floyd
Alfred
Caspian
Bram
Jasper
Clay
Chase (though I like it for a girl just a girlier version?)
Chad
Percy
Gilbert
Caspian: [name_f]Cassia[/name_f], [name_f]Pia[/name_f], [name_u]Cassidy[/name_u], [name_f]Cassandra[/name_f]
Harrison: [name_f]Harriet[/name_f], [name_u]Sunny[/name_u]
Gilbert: [name_f]Bernadette[/name_f], [name_f]Gail[/name_f], [name_f]Gidget[/name_f]
Chase: [name_f]Charity[/name_f] and [name_f]Chasity[/name_f]
Floyd: [name_f]Florence[/name_f], [name_f]Flo[/name_f], [name_f]Flora[/name_f], [name_f]Fleur[/name_f]
Alfred: [name_f]Alpha[/name_f], [name_u]Freddie[/name_u], [name_u]Allison[/name_u], [name_f]Alice[/name_f], [name_f]Alissa[/name_f], [name_f]Fredrika[/name_f]
Jasper: [name_u]Josie[/name_u], [name_f]Jana[/name_f], [name_f]Jane[/name_f]
Jake: [name_f]Jana[/name_f], [name_f]Jane[/name_f]
Liam: [name_f]Leah[/name_f], [name_f]Lily[/name_f], [name_u]Leigh[/name_u]
Emyrs: [name_u]Emery[/name_u], [name_f]Emersyn[/name_f], [name_f]Emerald[/name_f], [name_f]Esme[/name_f]
That’s all I could think of!
None of these are 100% female versions, but see below for inspiration!
Todd – [name_f]Tonya[/name_f]?
Jacob/Jake – Jaconda?
Emrys – [name_f]Emily[/name_f]
Liam – Wilhemina, [name_f]Mina[/name_f], [name_f]Lena[/name_f]
Harrison – [name_f]Hariette[/name_f]
Floyd – [name_f]Flora[/name_f]
Alfred – [name_f]Alfrida[/name_f]
Caspian – [name_f]Cassandra[/name_f]
Bram –
Jasper – [name_f]Jasmine[/name_f]
Clay – [name_f]Clara[/name_f]
Chase (though I like it for a girl just a girlier version?) – [name_f]Chiara[/name_f]
Chad – [name_f]Karen[/name_f]
Percy – [name_f]Persephone[/name_f]
Gilbert – [name_f]Gillian[/name_f]
I’m not very good with this kind of thing, so this is all I could think of.
[name_f]Dot[/name_f] or [name_f]Dottie[/name_f] for [name_m]Todd[/name_m]
[name_u]Emery[/name_u] for [name_m]Emrys[/name_m]
[name_f]Lia[/name_f] for [name_u]Liam[/name_u]
[name_f]Harriet[/name_f] for [name_m]Harrison[/name_m]
[name_f]Flora[/name_f] for [name_m]Floyd[/name_m]
[name_f]Cassia[/name_f] for [name_m]Caspian[/name_m]
[name_u]Juniper[/name_u] for [name_u]Jasper[/name_u]
[name_f]Clara[/name_f] or [name_f]Claire[/name_f] for [name_m]Clay[/name_m]
[name_f]Chastity[/name_f] for [name_u]Chase[/name_u]
[name_f]Persephone[/name_f] or [name_f]Mercy[/name_f] for [name_u]Percy[/name_u]
Theo and [name_f]Tomke[/name_f] are the closest I the closest I could think of.
Jacob/Jack: [name_u]Jackie[/name_u]
[name_m]Emrys[/name_m]: [name_f]Emrie[/name_f] or [name_f]Emeri[/name_f]
[name_m]Harrison[/name_m]: [name_f]Harriet[/name_f]
[name_m]Floyd[/name_m]: [name_u]Floy[/name_u]
[name_m]Alfred[/name_m]: [name_f]Alfreda[/name_f]
[name_m]Caspian[/name_m]: [name_f]Cassiane[/name_f]
[name_m]Bram[/name_m]: [name_u]Bran[/name_u]?
[name_m]Clay[/name_m]: [name_f]Clea[/name_f] or [name_u]Klee[/name_u]
[name_u]Chase[/name_u]: [name_m]Can[/name_m]’t think of much here, [name_f]Grace[/name_f]… sounds like it…
[name_m]Chad[/name_m]: [name_f]Charli[/name_f]?
[name_m]Gilbert[/name_m]: [name_f]Gilberte[/name_f]
[name_u]Liam[/name_u], [name_u]Jasper[/name_u], and [name_u]Percy[/name_u] I think could work for girls in my opinion
Tom: [name_u]Toma[/name_u], [name_f]Tamsin[/name_f], [name_f]Tamsyn[/name_f], Tomine, [name_f]Tamar[/name_f], [name_f]Tama[/name_f], [name_f]Tamara[/name_f]
Todd: [name_f]Dot[/name_f], [name_f]Dottie[/name_f]
Jacob/Jake: [name_f]Jacklyn[/name_f], [name_f]Jaclyn[/name_f], [name_f]Jacquelyn[/name_f], [name_f]Jacqueline[/name_f], [name_f]Jaqueline[/name_f], [name_f]Jacoba[/name_f], [name_f]Jacobina[/name_f], [name_f]Jacobine[/name_f], Jacomina, Coba, [name_f]Bine[/name_f], [name_f]Jakoba[/name_f], Giacoma, [name_u]Jackie[/name_u]
Emrys: [name_m]Emrys[/name_m] is a variant of [name_m]Ambrose[/name_m], so maybe [name_f]Ambrosia[/name_f]?
Liam: [name_f]Ilma[/name_f] is a short form of [name_f]Wilhelmina[/name_f], a feminine variation of [name_m]William[/name_m]
Harrison: no ideas
Floyd: no ideas
Alfred: [name_f]Alfreda[/name_f], [name_f]Freda[/name_f], [name_f]Elfreda[/name_f], [name_f]Alfre[/name_f], [name_f]Frida[/name_f], [name_f]Elfrieda[/name_f]
Caspian: no ideas
Bram: no ideas
Jasper: [name_u]Jasper[/name_u] is also the feminine variation; in addition, you may look at Jaspa, Jaspah
Clay: possibly use [name_f]Caly[/name_f]?
Chase: no ideas
Chad: [name_m]Chad[/name_m] is a form of [name_m]Charles[/name_m], so maybe [name_f]Charlotte[/name_f] --> [name_f]Char[/name_f], [name_f]Chara[/name_f], [name_f]Charl[/name_f], [name_f]Charle[/name_f]
Percy: no ideas
Gilbert: [name_f]Gilberte[/name_f], [name_f]Gilberta[/name_f], [name_f]Gilbertine[/name_f], [name_f]Gilbertina[/name_f]
Some of these aren’t directly related but either sound like the male name or are close to a version of the name.
Tom - [name_f]Tomasa[/name_f], [name_f]Tomeka[/name_f], [name_m]Tommie[/name_m], Tomisha
Todd - Tondra, [name_f]Dot[/name_f]
Jacob/Jake - [name_f]Jacqueline[/name_f], [name_f]Jaclyn[/name_f], [name_u]Jackie[/name_u]
Emrys - [name_u]Ember[/name_u], [name_u]Emery[/name_u], [name_f]Emmy[/name_f], Emyra
Liam - [name_f]Lianne[/name_f], [name_f]Lia[/name_f], [name_f]Mila[/name_f]
Harrison - [name_f]Harriet[/name_f], Harys
Floyd- [name_f]Flo[/name_f], [name_f]Fleur[/name_f], [name_f]Florence[/name_f], [name_f]Flora[/name_f]
Alfred - [name_u]Freddie[/name_u], [name_f]Freda[/name_f], [name_f]Freya[/name_f],
Caspian - [name_u]Aspen[/name_u], [name_f]Cassa[/name_f], [name_f]Cassie[/name_f], [name_f]Pia[/name_f],
Bram - [name_f]Branna[/name_f], [name_f]Brandy[/name_f], [name_f]Branwen[/name_f]
Jasper- [name_f]Jasmine[/name_f], [name_u]Jazz[/name_u], [name_u]Aspen[/name_u]
Clay- [name_f]Clara[/name_f], [name_f]Cleo[/name_f]
Chase - [name_f]Chastity[/name_f], [name_u]Chance[/name_u] (I think [name_u]Chase[/name_u] is lovely for a girl!)
Chad - [name_m]Chad[/name_m] is a diminutive of [name_m]Charles[/name_m] so maybe [name_u]Charlie[/name_u]?
Percy - [name_f]Perrie[/name_f] or [name_f]Mercy[/name_f] (I think [name_u]Percy[/name_u] is great for a girl too)
Gilbert - [name_u]Gilly[/name_u], [name_f]Alberta[/name_f], [name_u]Bertie[/name_u], [name_f]Gillian[/name_f]
[name_f]Jacoba[/name_f], Jacomina, [name_f]Jacqueline[/name_f], Jakeline
Harridaughter, no sorry 
[name_f]Wilhelmina[/name_f], [name_f]Mina[/name_f], [name_f]Helma[/name_f], [name_f]Willa[/name_f]
[name_f]Alfreda[/name_f], [name_f]Alfrieda[/name_f]
[name_f]Gilberta[/name_f]
This are all I could think of. I hope it helps.
Another feminine version of [name_m]Thomas[/name_m] is [name_f]Tamsin[/name_f], so…[name_m]Tom[/name_m] = [name_m]Tam[/name_m]?
Sorry for any repeats
[name_m]Tom[/name_m]: [name_f]Tomasa[/name_f], Tomisha, Tommiah, [name_f]Tomeka[/name_f], [name_m]Tomlin[/name_m], [name_m]Tommie[/name_m]. [name_m]Tom[/name_m] means twin so maybe [name_f]Gemima[/name_f] (means ‘a twin’), Tamitha (means ‘twin’), [name_f]Tavia[/name_f] (means ‘twin’), and [name_u]Gemini[/name_u] which is the twin zodiac sign.
[name_m]Todd[/name_m]: [name_m]Todd[/name_m] means ‘fox’ so what about [name_u]Fox[/name_u] or [name_u]Kit[/name_u]? Vixen also means ‘fox like’
[name_m]Jacob[/name_m]/Jake: [name_u]Jackie[/name_u], [name_f]Jacqueline[/name_f], [name_f]Jaclyn[/name_f], [name_u]Jacey[/name_u], [name_m]Cobie[/name_m]
[name_m]Emrys[/name_m]: [name_u]Emery[/name_u], [name_u]Emory[/name_u], [name_f]Emmie[/name_f], [name_u]Emerson[/name_u], [name_f]Emma[/name_f], [name_f]Emmeline[/name_f], etc. Also [name_u]Rhys[/name_u]/Reese/Reec
[name_u]Liam[/name_u]: can’t think of any
[name_m]Harrison[/name_m]: [name_f]Harriet[/name_f], [name_f]Henrietta[/name_f], [name_f]Henriette[/name_f], [name_f]Etta[/name_f], or [name_f]Hattie[/name_f]
[name_m]Floyd[/name_m]: means gray so maybe [name_u]Gray[/name_u]/Grey/Grae
[name_m]Alfred[/name_m]: [name_u]Allie[/name_u], [name_u]Allison[/name_u], [name_f]Alice[/name_f], [name_f]Alba[/name_f], [name_u]Freddie[/name_u], [name_f]Frieda[/name_f], [name_f]Winifred[/name_f], [name_f]Amelia[/name_f], [name_f]Alma[/name_f]
[name_m]Caspian[/name_m]: [name_f]Cassie[/name_f], [name_f]Cassandra[/name_f], [name_f]Cassia[/name_f], [name_u]Cassidy[/name_u], Cassielle, [name_f]Cassiopeia[/name_f]. [name_m]Ian[/name_m] is the coltish form of [name_m]John[/name_m] so any girl name relating to [name_m]John[/name_m] like [name_u]Jean[/name_u], [name_u]Jeanne[/name_u], or [name_f]Joanna[/name_f]. Also [name_f]Isla[/name_f], [name_f]Iona[/name_f], [name_f]Nia[/name_f], [name_f]Ina[/name_f]
[name_m]Bram[/name_m]: [name_m]Bram[/name_m] is short for [name_m]Abraham[/name_m] so maybe [name_f]Abra[/name_f], [name_u]Abril[/name_u]. [name_m]Bram[/name_m] has the word [name_m]Ram[/name_m] in it a s the zodiac sign [name_m]Aries[/name_m] is a [name_m]Ram[/name_m]. [name_m]Aries[/name_m] is a nice name for a girl.
[name_u]Jasper[/name_u]: [name_f]Jasmine[/name_f], [name_u]Jacey[/name_u]
[name_m]Clay[/name_m]: [name_f]Clara[/name_f], [name_f]Clarissa[/name_f], Claya
[name_m]Chad[/name_m]: chad is short for [name_m]Charles[/name_m] so maybe [name_u]Charlie[/name_u] or [name_f]Charlotte[/name_f]?
[name_u]Percy[/name_u]: [name_f]Persephone[/name_f], [name_u]Percy[/name_u], [name_f]Posey[/name_f], [name_f]Pricilla[/name_f], Persimmon
[name_m]Gilbert[/name_m]: [name_f]Gilberta[/name_f], [name_f]Gilda[/name_f], [name_f]Gillian[/name_f], [name_f]Gila[/name_f], [name_u]Gilly[/name_u], Gilma, [name_f]Gilana[/name_f]
[name_f]Hope[/name_f] this helps 
Liam: I think [name_u]Liam[/name_u] could be used as a girl’s name.
Harrison: [name_u]Harry[/name_u], [name_f]Harriet[/name_f]?
Alfred: [name_u]Alfie[/name_u], [name_u]Freddy[/name_u]?
Jasper: I think [name_u]Jasper[/name_u] could be used as a girl’s name.
Chase: Like you said, I think [name_u]Chase[/name_u] could be used as a girl’s name.
Percy: I think [name_u]Percy[/name_u] could be used as a girl’s name.
Gilbert: [name_u]Gill[/name_u], [name_u]Julian[/name_u], [name_u]Bert[/name_u], [name_f]Alberta[/name_f], [name_f]Bertha[/name_f]?
Tamsin maybe, as it’s a shortening of [name_f]Thomasina[/name_f], to my knowledge?
Thomas- [name_f]Tamara[/name_f] (it’s not that close, but my father is named [name_m]Thomas[/name_m] and [name_f]Tamara[/name_f] is his sister)
[name_m]Emrys[/name_m]- [name_f]Emmie[/name_f], [name_f]Emily[/name_f], [name_f]Emma[/name_f], [name_u]Emory[/name_u]
[name_m]Floyd[/name_m]- [name_u]Flynn[/name_u], [name_f]Fiona[/name_f]
[name_m]Caspian[/name_m]- [name_f]Cassandra[/name_f], [name_f]Cassie[/name_f], [name_u]Cass[/name_u]
[name_m]Bram[/name_m]- [name_f]Bea[/name_f]?
[name_u]Jasper[/name_u]- [name_u]Juniper[/name_u]
[name_u]Chase[/name_u]- Chaseth, Chasie (like [name_f]Jaycie[/name_f]?)
[name_m]Chad[/name_m]- Chadina? I feel like I’m just making them up now, lol.
[name_u]Percy[/name_u]- Periwinkle?
[name_m]Gilbert[/name_m]- [name_f]Gillian[/name_f] ([name_f]Jillian[/name_f])