Throughout the world, สุดายงค์ (สุดายงค์ 
) is a very rare dominantly feminine, but seldom boy's forename. The first name สุดายงค์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare mostly feminine, but seldom boy's name. Likewise, สุดายงค์ is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| สุดายงค์ | Thailand |