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Family name Watai (Watai ) , all around the world, is a rare cognomen. The surname Watai is habitual in Papua New Guinea, where it is quite a rare surname, Kenya, where it is a rare surname, and New Zealand, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in Papua New Guinea, Kenya, and the United States. Much less frequently, Watai is the forename as well as the last name.