Cognomen Wong-Ngoen (Wong-Ngoen 
) , throughout the world, is an extremely rare family name. The cognomen Wong-Ngoen is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname. Parts of the name also exists independently as a last name Wong, and a first name Ngoen.
| VARIANT | COUNTRY |
|---|---|
| Wong-Ngoen | Thailand |