Surname Ratjen (Ratjen 
) , around the world, is a rare cognomen. The surname Ratjen is characteristic of Germany, where it is a rare surname, Denmark, and Switzerland. In absolute terms, it is commonest in Germany, the United States, and Denmark. Much less frequently, Ratjen is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Ratjen | Germany, Switzerland, United States, India, Denmark |
| henning ratjen German lawyer and librarian (1793-1880), DE (b. 1793) |
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| adolf ratjen (b. 1845) |
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dora ratjen German high jumper, DE (b. 1918) |
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| rudolf ratjen DE (b. 1881) |
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| martha ratjen DE (b. 1885) |
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| karl-gustav ratjen German manager (1919-2010), DE (b. 1919) |
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| hans ratjen (b. 1909) |
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| ursula ratjen DE (b. 1917) |
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| hermann ratjen DE (b. 1920) |
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| wolfgang ratjen German art collector 1943-1997, DE (b. 1943) |
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| jörg ratjen German film actor and stage actor, DE (b. 1963) |
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| sebastian ratjen German politician (1972-2018), DE (b. 1972) |
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| ilka ratjen researcher |
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| lars ratjen researcher |
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| felix ratjen researcher |
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