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Family name Isah (Isah , Иса , イサ ) , worldwide, is a widespread last name. The cognomen Isah is characteristic of Nigeria, where it is a common surname, India, where it is quite a common surname, and Kyrgyzstan. Not in comparison with a country's population, it is commonest in Nigeria, India, and Indonesia. Also, Isah is the forename as well as the last name.