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Family name Euan (Euan , 尤安 , ユアン ) , all around the world, is a common surname. The family name Euan is characteristic of Mexico, where it is quite a common surname, Japan, where it is a rare surname, and Malaysia. Measured by absolute frequency, it is commonest in Mexico, Japan, and China. Much less frequently, Euan is the forename as well as the last name.