Well... although I didn't specify initially... I think I'd better limit it to just the American version's names. There's a few reasons for that; one is that not too many people know (any of) the Japanese names (myself included. ). But more importantly, there can be more than one (correct) romanization of a Japanese word or name. Since the Japanese language is a syllabary-based language, and not a letter-based one like ours, there could conceivably be a conflict on the subject of spelling. I'm sorry, but I think it's best if we just use the American names.
The letters you need to find are "th", btw.