Family name เพญ (Phen 
, เพญ ) , around the world, is quite a rare cognomen. The cognomen เพญ is habitual in Bermuda, where it is quite a common surname, Malaysia, where it is quite a rare surname, and Hong Kong. Measured by absolute frequency, it is commonest in South-eastern Asia, particularly Indonesia, Malaysia, and Myanmar. Also, เพญ is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Phen | Laos, Myanmar, Malaysia, Thailand, Indonesia |
| เพญ | Thailand |