This is pretty awesome and they're all associated with audio. Here is a quote form EA dev Rocky.
Source: http://forum.ea.com/eaforum/posts/list/90/476223.page
"It was confirmed by our creative director at E3, so I've decided to share it with the rest of you. It's possible to choose a first name, last name, and nickname for your created fighter.
As of today, we have 475+ first names, 550+ last names, and 200+ nicknames with associated audio.
Yes, some of those names were included because of this thread"
Source: http://forum.ea.com/eaforum/posts/list/90/476223.page