Hang on dude, you're making so many assumptions and running with them, it's hard to catch up. The exact pronunciation of レヴィ is Re-Vui. Now I haven't seen any of Fairy Tale, but in most cases, Japanese will use Bi (ビ) to approximate a Vi sound because Vui (ヴィ) produces a very distinct dipthong, such as in DVD (ヂヴィヂ). I have the feeling you just used the katakana keyboard and typed in Re Vi and wanted to check that you were aware that the ヴ is really a U with a dakuten and not a true Vi sound.