Yes, it has been done before, but the topic is too old so I'm starting a new one.
Original: Tristan
Japanese: トリスタン
Transliterated: Torisutan
Ima call myself Tori from now on :3
EDIT: You must have the transliterated form (using the Latin alphabet.) To do this, on the Google Translate thing, click "read phonetically" and copy/paste that.