Surname Coulter (Coulter , קולטר , Култер ) , across the world, is a common last name. The last name Coulter is habitual in Reunion, where it is quite a common surname, New Zealand, where it is quite a rare surname, and Australia. Not in comparison with a country's population, it is the most numerous in the United States, the United Kingdom, and Canada. Very seldom, Coulter is the forename as well as the last name.