Globally, Koelsum (Koelsum 
) is a rare feminine first name. The first name Koelsum is habitual in Sub-Saharan Africa, particularly South Africa, where it is a rare girly name. Very seldom, Koelsum is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Koelsum | Indonesia, South Africa |
De, Vanker, Isaacs, Mohamed, Saville, Awaldien, Roberts, Heynes, Ryklief, Fortune, Abrahams, Canfield, Williams, Alexander, Hendricks, Ghansar, Wolmarans, Harris, Essack, Aziz, Peck, Sevis, Allie, Abdol, Abass, Emeran, Adams, Simons, Kimmie, Parker, Davids, Gamiet, Jacobs, White, and Ehrenreich