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Last name Flax (Flax , פלקס , Флах ) , around the world, is quite a rare cognomen. The cognomen Flax is habitual in Reunion, where it is quite a common surname, Trinidad and Tobago, where it is quite a rare surname, and Israel. In absolute terms, this name is the most popular in the United States, Egypt, and Israel. Very seldom, Flax is the forename as well as the last name.