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Family name Merren (Merren ) , globally, is a rare cognomen. The family name Merren is habitual in Cayman Islands, where it is quite a common surname, Honduras, where it is quite a rare surname, and Ireland, where it is a rare surname. Measured by absolute frequency, the name is most common in the United States, Honduras, and Ireland. Likewise, Merren is the forename as well as the last name.