Watai (written: 渡井) is a Japanese surname. Notable people with the surname include:
Masaki Watai (渡井理己, born 1999), Japanese footballer
Miyoko Watai (渡井美代子, born 1945), Japanese chess player
Surname list
This page lists people with the surnameWatai. If an internal link intending to refer to a specific person led you to this page, you may wish to change that link by adding the person's given name(s) to the link.