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Family name Oswin (Oswin ) , all around the world, is quite a rare cognomen. The family name Oswin is characteristic of Eswatini, where it is quite a common surname, the United Kingdom, where it is a rare surname, and New Zealand. Not in comparison with a country's population, it is the most numerous in the United Kingdom, Tanzania, and Indonesia. More prevalently, Oswin is the forename as well as the last name.