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Last name Gallan (Gallan ) , in the world, is quite a rare family name. The last name Gallan is habitual in Trinidad and Tobago, where it is quite a rare surname, Somalia, and Italy, where it is a rare surname. Not in comparison with a country's population, it is the most numerous in Italy, Philippines, and Somalia. Very seldom, Gallan is the forename as well as the last name.