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Surname Keehan (基恩 , Keehan , קיהן ) , in the entire world, is quite a rare cognomen. The cognomen Keehan is characteristic of Ireland, where it is quite a rare surname, New Zealand, where it is a rare surname, and Israel. Not in comparison with a country's population, this name is the most popular in the United States, Ireland, and China. Likewise, Keehan is the forename as well as the last name.