Surname เก่งถนอมศักดิ์ (เก่งถนอมศักดิ์, Kengtanomsak 
) , all around the world, is a very rare cognomen. The family name เก่งถนอมศักดิ์ is habitual in South-eastern Asia, particularly Thailand, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Kengtanomsak | Thailand |