Last name เพ็ญถนอม (เพ็ญถนอม 
) , around the globe, is a very rare cognomen. The surname เพ็ญถนอม is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare surname. Very seldom, เพ็ญถนอม is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| เพ็ญถนอม | Thailand |