Cognomen Wairak (Wairak 
) , throughout the world, is a very rare last name. The surname Wairak is characteristic of Thailand, where it is a very rare surname, the United States, where it is an extremely rare surname, and India. Much less frequently, Wairak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Wairak | India, United States, Thailand |