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Worldwide, Tønnesson (Tønnesson ) is an extremely rare unknown gender given name. Much more frequently, Tønnesson is the last name as well as the forename.
Toennesson, Tønnesen, Tønnessen, and Tønnsen
Pål, Simen, Stein, Kåre, Johan, Niels, Heidi, and Øyvind