Family name চম (Chaum 
, চম) , globally, is a rare cognomen. The surname চম is habitual in South-eastern Asia, particularly Thailand, where it is a rare surname, Myanmar, where it is a very rare surname, and Malaysia. Measured by absolute frequency, it most frequently occurs in Thailand, Myanmar, and the United States. Also, চম is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Chaum | Myanmar, France, Malaysia, Thailand, United States |