Last name Dumjahn (Dumjahn 
) , in all the world, is a rare cognomen. The last name Dumjahn is habitual in Western Europe, particularly Germany, where it is a rare surname.
| VARIANT | COUNTRY |
|---|---|
| Dumjahn | Germany |
| horst-werner dumjahn German photographer, DE (b. 1934) |
|
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| ulrike dumjahn costume designer |
|