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In the entire world, Theisen (泰森 , 太森 , Theisen ) is quite a rare principally masculine, but scarcely feminine first name. The first name Theisen is habitual in Eastern Asia, particularly China, where it is a very rare predominantly male, but very infrequently female name. More frequently, Theisen is the last name as well as the forename.
Theisen is also a name for the fictitious and mythical characters: Tyson , the character in the series Percy Jackson & the Olympians, Percy Jackson & The Olympians - The Sea of Monsters and Takao Kinomiya , the Beyblade character.