Surname Coill (Coill 
) , in the world, is a very rare cognomen. The surname Coill is habitual in the United Kingdom, where it is a very rare surname, Venezuela, and the United States, where it is an extremely rare surname. Not in comparison with a country's population, this name is the most popular in the United States, the United Kingdom, and Germany. Very seldom, Coill is the forename as well as the last name.