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Last name Guinan (Guinan , 吉南 , 贵男 ) , across the world, is quite a rare surname. The last name Guinan is habitual in Ireland, where it is quite a common surname, Bermuda, and Ivory Coast, where it is quite a rare surname. Measured by absolute frequency, this name is the most popular in the United States, Ireland, and China. Likewise, Guinan is the forename as well as the last name.