Cognomen Koelsoem (Koelsoem 
) , around the globe, is a rare last name. The cognomen Koelsoem is habitual in South-eastern Asia, particularly Indonesia, where it is a very rare surname. Very seldom, Koelsoem is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Koelsoem | Indonesia, South Africa |