Family name Колум (Colum , Колум , Coluim ) , in all the world, is a rare surname. The last name Колум is habitual in Ireland, where it is a rare surname, Australia, and Chile, where it is a very rare surname. Measured by absolute frequency, the name is most common in the United States, Australia, and Ireland. More frequently, Колум is the forename as well as the last name.