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Cognomen Ritsing (Ritsing , ริท ) , across the world, is a very rare family name. The surname Ritsing is habitual in Northern Europe, particularly Estonia, where it is quite a rare surname, Denmark, where it is a rare surname, and Finland. Not in comparison with a country's population, it is the most numerous in Denmark, Thailand, and Estonia. Very seldom, Ritsing is the forename as well as the last name.