Family name Waiyawut (วัยวุฒิ 
, ไวยวุฒิ , Waiyawut 
) , all over the world, is a rare cognomen. The surname Waiyawut is habitual in Thailand, where it is quite a rare surname, and the United States, where it is an extremely rare surname. Also, Waiyawut is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| วัยวุฒิ, ไวยวุฒิ | Thailand |
| Waiyawut | United States, Thailand |