I've never read LotR or seen the films in their entirety, but I know perfectly well that
Eowyn is a female character. Especially after the films, pretty much everyone is familiar with LotR stuff. And that you don't know about
Miles Davis does not cancel the fact that a lot of people know about him and will consider the name masculine.
I hope I don't come across as being rude, but you can't keep imagining that if you don't get a certain reference it doesn't matter, or just rely on the fact that in your mind a few people won't get a reference and therefore it doesn't matter.
Anyway, as
Siri said, I too can tollerate a female
Miles (our own BtN
Miles seems ok enough with it), but naming a boy
Eowyn is like naming him
Hermione or something.