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Family name Callow (كالو
, 卡洛
, Callow
) , all around the world, is quite a common cognomen. The last name Callow is characteristic of Isle of Man, where it is quite a common surname, Syria, where it is quite a rare surname, and Sudan. Measured by absolute frequency, it is the most numerous in the United Kingdom, Sudan, and the United States. Much less frequently, Callow is the forename as well as the last name.