Surname เพ็ญสิทธิ์ (Penit 
, เพ็ญสิทธิ์ 
) , across the world, is a rare last name. The last name เพ็ญสิทธิ์ is habitual in Philippines, where it is a rare surname, Thailand, and France, where it is a very rare surname. Very seldom, เพ็ญสิทธิ์ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Penit | Spain, Philippines, India, China, France |
| เพ็ญสิทธิ์ | Thailand |