Last name Oetjen (Oetjen 
) , all around the world, is quite a rare family name. The last name Oetjen is characteristic of Germany, where it is quite a rare surname, Estonia, where it is a rare surname, and the United States, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in Germany, the United States, and Australia.
| VARIANT | COUNTRY |
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| Oetjen | China, United States, Germany, France, Australia |
| heinrich oetjen (b. 1874) |
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jan-christoph oetjen German politician, DE (b. 1978) |
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| robert oetjen Estonian conservationist, EE (b. 1970) |
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| h. oetjen researcher |
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| elke oetjen researcher |
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| karl oetjen researcher (ORCID 0000-0002-5079-6655) |
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| janina oetjen researcher |
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| jan oetjen DE (b. 1972) |
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| vera oetjen |
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| lucia oetjen CH (b. 1981) |
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