You can give the character whatever name you want. I don't really care if "Hilbert" is a god-awful name, I called my PC my real name. --- Official Starclaw of PGD and Arcanine of team noir! The Official Shiny Zangoose of the X/y Board!
And good thing that they're suggested to have different default names (Callum and Serena) based on the the latest CoroCoro, right?
Don't they almost always have different names in japanese and english?
Yes. Starting with Gen 3 (when they stopped naming the characters after the games) Yuki/Haruka = Brendan/May Koki/Hikari = Lucas/Dawn Hibiki/Kotone = Ethan/Lyra Toya/Toko = Hilbert/Hilda Kyohei/Mei = Nate/Rosa
How often are the official names changed from the prerelease screens? (alternate: how many different names were in the prerelease screens?) --- Give me all teh FE D':