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Last name Llewellyn (Llewellyn , Llywelyn ) , in the entire world, is a common cognomen. The last name Llewellyn is characteristic of Latin America and the Caribbean, particularly Saint Vincent and the Grenadines, where it is quite a common surname, British Virgin Islands, and Jamaica. In absolute terms, it most frequently occurs in the United Kingdom, the United States, and Australia. Also, Llewellyn is the forename as well as the last name.