Distinctly male: Asterion, Azrael, Blork, Boris, Yiuf, Donald, Edmund, Eustachio, Frederick, Grum, Harold, Jorgrun, Jory, Joseph, Khufu, Menkaure, Mennas, Nessos, Nikola, Pikel, Prince Ribbit, Rupert, Roka, Sigmund, Terence, Polyphemus, Geryon, Murray, Antaeus, Asmodeus, Ignacio
Distinctly female: Arachne, Aizul, Psyche, Enchantress, Kirke, Bai Suzhen, Ijyb, Jessica, Josephine, Natasha, Nergalle, Roxanne, Sonja, Vashnia, Ilsiuw, Ereshkigal, Tiamat
Gender bender: Agnes, Sojobo, Dowan/Duvessa, Frances, Grum, Louise, Margery, Robin, Purgy/Snorg, Urug, Xtahua, Dispater, Cerebov, Hydra
Neuter or indistinct: Erica, Erolcha, Fannar, Gastronok, Grinder, Mara, Maurice, Dissolution, TRJ, Serpent of Hell, Gloorx, Lom Lobon, Mnoleg
The worst offender is Urug, who is not only the wrong gender for an epic javelineer, but also lacks an eye, which eliminates depth perception and thus ranged accuracy. Dispater is a close second: his name means "father" yet his pronoun is neuter. Flipping Sojobo's mythological gender and hoping nobody will notice is insulting. Grum should be female since hyenas are matriarchal.
I'm least certain about Purgy/Snorg, since maybe trolls are matriarchal. Well, they're social and led by fragile (lower HP) support shamans, so I'll say they're matriarchal. Makes sense that females would need a lot of bodyweight to feed a ravenous troll baby. Fast gestation means one female can keep a harem to bring her food.