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Cognomen Irungu (Irungu ) , all around the world, is a common last name. The last name Irungu is characteristic of Kenya, where it is quite a common surname, United Arab Emirates, where it is quite a rare surname, and Qatar. In absolute terms, it is the most numerous in Sub-Saharan Africa, particularly Kenya, Tanzania, and Uganda. Much less frequently, Irungu is the forename as well as the last name.