Family name Detlefsen (Detlefsen 
) , all over the world, is quite a rare surname. The cognomen Detlefsen is habitual in Denmark, where it is quite a rare surname, Germany, and Guatemala, where it is a rare surname. Measured by absolute frequency, the name is most common in Germany, the United States, and Guatemala.
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| Detlefsen | Argentina, United States, Germany, Guatemala, Denmark |
Dethlefsen, Detlevsen, Ditlefsen, and Ditlevsen
| peter detlefsen DE (b. 1679) |
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detlef detlefsen German classical philologist, historian and teacher, DE (b. 1833) |
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| emil detlefsen (b. 1854) |
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max werner detlefsen German politician (1928-2016), DE (b. 1928) |
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| otto detlefsen Danish opera singer (1881-1963), DK (b. 1881) |
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| paul detlefsen American artist (1899-1986), US (b. 1899) |
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| hans detlefsen German painter (1923-1992), DE (b. 1923) |
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| michael detlefsen American logician, US (b. 1948) |
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| jürgen detlefsen DE (b. 1943) |
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| lars detlefsen Danish screenwriter, DK (b. 1967) |
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| louise detlefsen Danish film director (b. 1971) |
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| hans-jörg detlefsen DE (b. 1963) |
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| kai detlefsen Ph.D. Humboldt-Universität zu Berlin 2007 (b. 1976) |
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| nicki skafte detlefsen researcher, machine learning, Technical University of Denmark |
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| nina detlefsen Dr.-Ing. Norges Teknisk-Naturvitenskapelige Universitet 1999 |
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