Cognomen Ottenjann (Ottenjann 
) , throughout the world, is a rare surname. The surname Ottenjann is habitual in Western Europe, particularly Germany, where it is a rare surname. Much less frequently, Ottenjann is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Ottenjann | Germany |
| heinrich ottenjann DE (b. 1886) |
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| helmut ottenjann German archaeologist, DE (b. 1931) |
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| rudolf ottenjann (b. 1926) |
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