Across the world, เพ็ญสิทธิ์ (Penit 
, เพ็ญสิทธิ์ 
) is a very rare unisex forename. The first name เพ็ญสิทธิ์ is characteristic of Thailand, where it is a very rare epicene name, and India, where it is an extremely rare epicene name. More prevalently, เพ็ญสิทธิ์ is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Penit | China, Spain, Philippines, India, France |
| เพ็ญสิทธิ์ | Thailand |