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Family name Micah (Micah , Мика , מיכה , and others...) , around the world, is a common surname. The last name Micah is habitual in Bulgaria, where it is quite a common surname, Nigeria, where it is quite a rare surname, and Japan. Measured by absolute frequency, it is commonest in Nigeria, Japan, and Ghana. Also, Micah is the forename as well as the last name.