A portmanteau of the Japanese word tamago and the English word watch (ウオッチ uocchi). Early on, in Japan, Tamagotchi was written in English as Tamagotch. When the Tamagotchi was introduced overseas, an "i" was added at the end or the name. Recently, Japan has followed this and replaced Tamagotch for Tamagotchi.
Tamagotchi (plural Tamagotchis)