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Last name Kirton (Kirton ) , in all the world, is quite a common surname. The cognomen Kirton is habitual in Latin America and the Caribbean, particularly Barbados, where it is a common surname, Grenada, where it is quite a common surname, and Saint Lucia (explore the name in all countries). Measured by absolute frequency, it is the most numerous in the United Kingdom, the United States, and Canada. Very seldom, Kirton is the forename as well as the last name.