Cognomen ถนอมดำรงศักดิ์ (ถนอมดำรงศักดิ์, Tanomdamrongsak 
) , all around the world, is an extremely rare surname. The cognomen ถนอมดำรงศักดิ์ is habitual in South-eastern Asia, particularly Thailand, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Tanomdamrongsak | Thailand |