Family name Yoiyangthong (Yoiyangthong 
) , all around the world, is an extremely rare cognomen. The cognomen Yoiyangthong is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Yoiyangthong | Thailand |
Aulai, Khemika, and Chaiyachat