In the entire world, テツイ (テツイ ) is an extremely rare unknown gender forename. Likewise, テツイ is the last name as well as the forename.
Tetsi, Tetsui, Tetui, 哲以, 哲伊, and 哲威
) is an extremely rare unknown gender forename. Likewise, テツイ is the last name as well as the forename.