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Surname Coar (科尔 , Coar ) , in the world, is a rare family name. The surname Coar is characteristic of Trinidad and Tobago, where it is quite a rare surname, the United States, where it is a rare surname, and the United Kingdom. Measured by absolute frequency, it most frequently occurs in the United States, the United Kingdom, and China. Also, Coar is the forename as well as the last name.