It depends on why you would choose a name. You could ask your parents what they would have named you or name yourself after someone, which would be the easiest probably. Or you could just look through a name list and try them out. You could do that on here, or there's this Tumblr blog called names-and-pronouns.tumblr.com, which uses your name and pronouns in a sentence. Or just ask your friends/family to try using them.
