Katakana: ターレス
Hepburn: Tāresu
Toei/Bandai: Tulece (once Turlece)
Funimation: Turles
In katakana, his name is ターレス (tāresu). His name is a pun on the English word "lettuce", which is レタス (retasu) in katakana. Swap the katakana around, add the long sound symbol ー (chōonpu), and you get ターレス...