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Family name Isaiah (Isaiah , ישעיהו , ישעיה ) , all around the world, is a common surname. The cognomen Isaiah is characteristic of Vanuatu, where it is quite a common surname, Nigeria, and Israel, where it is quite a rare surname. Not in comparison with a country's population, it is commonest in Sub-Saharan Africa, particularly Nigeria, Kenya, and Ghana. Likewise, Isaiah is the forename as well as the last name.