Across the world, เพ็ญจันทร (เพ็ญจันทร 
) is a very rare dominantly girly, but infrequently boy's first name. The given name เพ็ญจันทร is habitual in South-eastern Asia, particularly Thailand, where it is a very rare gender-neutral name. Much less frequently, เพ็ญจันทร is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| เพ็ญจันทร | Thailand |