So I am a trans guy and am considering the name Felix for myself, and I want to come up with an epic middle (or two) for it! Because this is for myself, don’t worry about something a kid might grow up to resent. Just have fun. Bonus points for cool connections or meanings!
Some names I’ve thought of are Othniel (after Othniel Charles Marsh, paleontologist), Calypso, Wilde (after Oscar Wilde), Lysander, Odyssey, Ocean, Jasper, Ozzy, Isaiah, Stellan, Haven, Valen, Marinell, and Maxim.
I love this genre of names!!
Some on my list you might like:
[name_m]Mariner[/name_m]
[name_m]Meridian[/name_m]
[name_m]Viridian[/name_m]
[name_m]Hopewell[/name_m]
[name_f]Makepeace[/name_f]
Dovecote
[name_m]Aeneas[/name_m] (Uh-NEE-iss)
[name_m]Bramble[/name_m]
[name_m]Faraday[/name_m]
[name_m]Valentine[/name_m]
[name_m]Tennyson[/name_m]
[name_m]Valor[/name_m]
[name_m]Noble[/name_m]
[name_m]Wilder[/name_m]
Menelaus (Men-uh-LAY-us)
[name_m]Laertes[/name_m] (Lay-AIR-dees)
[name_m]Wulfric[/name_m]
[name_m]Ptolemy[/name_m]
[name_m]Thackeray[/name_m]
[name_m]Valerian[/name_m]
[name_m]Alaric[/name_m] (AL-uh-rick)
[name_m]Cato[/name_m]
[name_m]Evren[/name_m]
[name_m]Faolan[/name_m] (FAY-lawn)
[name_m]Freyr[/name_m]
[name_m]Galen[/name_m]
[name_f]Lydian[/name_f]
[name_m]Perseus[/name_m]
[name_m]Theseus[/name_m]
[name_m]Westley[/name_m]
Wyeth
[name_f]Hope[/name_f] this helped!!
[name_f]Love[/name_f] [name_m]Felix[/name_m] [name_m]Wilde[/name_m] & [name_m]Felix[/name_m] [name_m]Valen[/name_m] from your list.
Some other ideas, sorry for any repeats 
[name_m]Felix[/name_m] [name_m]Anakin[/name_m]
[name_m]Felix[/name_m] [name_m]Roswell[/name_m]
[name_m]Felix[/name_m] [name_m]Dragan[/name_m]
[name_m]Felix[/name_m] [name_m]Houston[/name_m]
[name_m]Felix[/name_m] Coffey
[name_m]Felix[/name_m] [name_f]Journey[/name_f]
[name_m]Felix[/name_m] [name_m]Onyx[/name_m]
[name_m]Felix[/name_m] [name_m]Bowie[/name_m]
[name_m]Felix[/name_m] [name_m]Sheriff[/name_m]
[name_m]Felix[/name_m] [name_m]Dino[/name_m]
[name_m]Felix[/name_m] [name_m]Carlisle[/name_m]
[name_m]Felix[/name_m] [name_m]Kodiak[/name_m]
[name_m]Felix[/name_m] [name_m]Oswald[/name_m]
[name_m]Felix[/name_m] [name_m]Valentino[/name_m]
[name_m]Felix[/name_m] [name_m]Knight[/name_m]
[name_m]Felix[/name_m] [name_m]Solomon[/name_m]
[name_m]Felix[/name_m] Adder
[name_m]Felix[/name_m] [name_m]Hamilton[/name_m]
[name_m]Felix[/name_m] [name_m]Stetson[/name_m]
[name_m]Felix[/name_m] [name_m]Willoughby[/name_m]
[name_m]Felix[/name_m] [name_m]Reggie[/name_m]
[name_m]Felix[/name_m] Spade
[name_m]Felix[/name_m] [name_m]Joffrey[/name_m]
[name_m]Felix[/name_m] [name_m]Thorne[/name_m]
[name_m]Felix[/name_m] [name_m]Caspian[/name_m]
[name_m]Felix[/name_m] [name_m]Wolfe[/name_m]
[name_m]Felix[/name_m] [name_m]Teo[/name_m]
[name_m]Felix[/name_m] [name_m]Rocket[/name_m]
[name_m]Felix[/name_m] [name_m]Memphis[/name_m]
[name_m]Felix[/name_m] Hawke
[name_m]Felix[/name_m] [name_m]Castle[/name_m]
[name_m]Felix[/name_m] [name_m]Todrick[/name_m]
[name_m]Felix[/name_m] [name_f]Kirby[/name_f]
[name_m]Felix[/name_m] McCauley
[name_m]Felix[/name_m] [name_m]Ajax[/name_m]
[name_m]Felix[/name_m] [name_m]Neo[/name_m]
[name_m]Felix[/name_m] [name_m]Damascus[/name_m]
[name_m]Felix[/name_m] [name_m]Blaze[/name_m]
[name_m]Felix[/name_m] [name_f]Indiana[/name_f]
[name_m]Felix[/name_m] [name_m]Falcon[/name_m]
You have a brilliant selection so far!
Maybe…
[name_m]Felix[/name_m] [name_m]Vyvyan[/name_m]
[name_m]Felix[/name_m] [name_m]Ignatius[/name_m]
[name_m]Felix[/name_m] [name_m]Arbor[/name_m]
[name_m]Felix[/name_m] [name_m]Brynmor[/name_m]
[name_m]Felix[/name_m] [name_m]Caedmon[/name_m]
[name_m]Felix[/name_m] [name_m]Marcellin[/name_m]
[name_m]Felix[/name_m] [name_m]Emilien[/name_m]
[name_m]Felix[/name_m] [name_m]Niles[/name_m]
[name_m]Felix[/name_m] [name_m]Nairn[/name_m]
[name_m]Felix[/name_m] [name_m]Salvador[/name_m]
[name_m]Felix[/name_m] [name_m]Dorian[/name_m]
[name_m]Felix[/name_m] Absolom
[name_m]Felix[/name_m] [name_m]Benvolio[/name_m]
[name_m]Felix[/name_m] [name_m]Meridian[/name_m]
[name_m]Felix[/name_m] [name_m]Prosper[/name_m]
[name_m]Felix[/name_m] [name_m]Ferdinand[/name_m]
[name_m]Felix[/name_m] [name_m]Ossian[/name_m]
[name_m]Felix[/name_m] [name_f]Marlowe[/name_f]
[name_m]Felix[/name_m] [name_m]Pendragon[/name_m]
[name_m]Felix[/name_m] [name_f]Waverley[/name_f]
[name_m]Felix[/name_m] [name_m]Merle[/name_m]
Love your list My favourite combos would be Felix Othniel (such a cool name, wow!), Felix Lysander and Felix Stellan. They sound like woodland fairy prince names 
Maybe:
Ayrthon, Alaric, Aurelion, Archeron, Auberon, Atlas, Altair, Andre/ Andrei, Ademir, Asterion, Atticus, Azarius, Aslan, Armand, Amadeus, Atticus, Auryn, Atreus, Averian, Benedict, Balthazar, Brynmor, Byron, Carlisle, Caius, Cornelius, Cedric, Cillian, Creed, Celestin, Cy, Casimir, Cassius, Caspian, Caradoc, Caladrius, Cedar, Cirrus, Ciaran, Cassander, Caedmon, Daphnis, Dacre, Dorian, Darius, Elidor, Eldarion, Evren, Evron, Erion, Evander, Everard, Eamond, Elvar, Florian, Florentin, Florimond, Florizel, Fate, Griffith, Hal, Hart, Hawthorne, Isidor, Ivor, Isildur, Ingmar, Ingram, Jupiter, Junius Kai, Knox, Kiur, Kaiea, Kieran, Kirion, Lucian, Leodegrance, Lorchlan, Lochlan, Laurent, Lawrence, Luther, Leopold, Leland, Layton, Leander, Linden, Murtagh, Mercury, Melchior, Mordecai, Mars, Merrick, Merrion, Noctis, November, Neleus, Nikolai, Octavian, Oaken, Osmanthus, Oleander, Orion, Odin, Osias, Orson , Oceanus, Otis, Oberon, Ottmar, Peregrin, Polaris, Phoenix, Percival, Raphael, Rhaegar, Rhydian, Raynor, Sylvan, Sonder, Silas, Uriel, Ulysses, Viridian/ Viridius , Verdi, Vikram, Wolfram, Wolfgang, Winston, Zephyr, Zuriel, Yves
[name_m]Valor[/name_m] or [name_m]Dresden[/name_m]