Surname Collam (Collam 
) , in all the world, is a very rare cognomen. The surname Collam is habitual in Finland, where it is a very rare surname, Thailand, and the United Kingdom, where it is an extremely rare surname. Not in comparison with a country's population, the name is most common in Thailand, the United States, and the United Kingdom.
| VARIANT | COUNTRY |
|---|---|
| Collam | Finland, Thailand, United Kingdom, India, United States |