I don't know why, but... Nymphs look like girls, so I'll never even think about giving them names that are not girls' names.
...
It actually surprised me that so many people give, ah, unorthodox names to their Nymphs.
Some nicknames are a little bit weird (Toots, for example is downright horrible for a nickname). However, even though Nymphs may have an apparent female anatomy, it doesn't necessarily mean that I'm going to name them after a female human name, because they're
not human still. Virtues or ideas, of course, are still okay (hence why I made my names similar to emotions, rather than ones in real life).
Maybe some Elements players are so nerdy that they are unable to distinguish a girl from a boy.
If those nerds also promote gender equality by not caring about distinguishing a card's personal gender, then by all means, I support that.