Cognomen Pentham (เป็นธรรม 
, Pentham 
) , all over the world, is a very rare family name. The surname Pentham is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname. Much less frequently, Pentham is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| เป็นธรรม | Thailand |
| Pentham | India, Thailand |