Cognomen ยลพัฒนศักดิ์ (ยลพัฒนศักดิ์ 
) , all over the world, is an extremely rare family name. The family name ยลพัฒนศักดิ์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| ยลพัฒนศักดิ์ | Thailand |