Cognomen ส้มป่อย (Somluan 
, ส้มป่อย, Somchaipeng ) , in all the world, is a rare surname. The surname ส้มป่อย is characteristic of South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, ส้มป่อย is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Pomongkol, Somchaipeng, Somluan | Thailand |
Pomngern, Pompeuak, Pomueang, Smpy, Som Poi, Somchaidi, Somchaimai, Somerumpai, Somkrabuan, Sompee, Sompeeti, Somphen, Somphian, Somphiang, Somphiew, Somphog, Somphoi, Sompoa, Sompoad, Sompoam, Sompoat, Sompoeng, Sompoong, Sompoonga, Sompowloy, Somprang, Sompratum, Somprum, Somprung, Sompuang, Somtob, and Sumphus