Family name Wai U (Wai U 
) , all around the world, is an extremely rare last name. The cognomen Wai U is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Much more prevalently, Wai U is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Wai U | Macao, Thailand |