Worldwide, เพ็ญสี (เพ็ญสี 
) is a very rare largely female, but uncommonly boy's forename. The first name เพ็ญสี is characteristic of South-eastern Asia, particularly Thailand, where it is a very rare largely feminine, but uncommonly male name.
| VARIANT | COUNTRY |
|---|---|
| เพ็ญสี | Thailand |