Surname Youngwiriyakul (Youngwiriyakul 
) , around the world, is an extremely rare last name. The surname Youngwiriyakul is characteristic of South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Youngwiriyakul | Thailand |
Kansasi, Ratsamee, and Chutchapol