Surname Weerasaeng (Weerasaeng 
) , in the entire world, is a very rare family name. The cognomen Weerasaeng is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Weerasaeng | Thailand |
Prawinee, Chanatphapa, Phatcharee, and Rattanaphon