Last name Koulm (Columba 
, Coulm 
, Koulm) , across the world, is a common surname. The family name Koulm is characteristic of Latin America and the Caribbean, particularly Mexico, where it is quite a common surname, Bolivia, where it is quite a rare surname, and Venezuela. Measured by absolute frequency, this name is the most popular in Mexico, Nigeria, and Venezuela. Also, Koulm is the forename as well as the last name.