Family name เพศสุข (เพศสุข 
) , all around the world, is a very rare cognomen. The last name เพศสุข is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| เพศสุข | Thailand |
ยุทธชัย, and ศักดิ์สิทธิ์