All over the world, Ernst-Otto (Ernst-Otto 
) is quite a rare boy's first name. The forename Ernst-Otto is habitual in Western Europe, particularly Germany, where it is quite a rare masculine name. Parts of the name also exists independently as a first name Ernst, and a first name Otto.
| VARIANT | COUNTRY |
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| Ernst-Otto | United States, Germany, Spain |
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ernst-otto reher German university teacher, DE (b. 1936) |
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ernst-otto berk German officer, DE (b. 1952) |
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| ernst-otto von dewitz (b. 1904) |
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| ernst-otto schlöpke German writer (1922-2011), DE (b. 1922) |
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| ernst-otto czempiel German political scientist, DE (b. 1927) |
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| ernst-otto schwabe German journalist, DE (b. 1929) |
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| ernst-otto krasemann DE (b. 1923) |
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| ernst-otto gerke DE (b. 1927) |
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| ernst-otto braasch DE (b. 1930) |
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| ernst-otto meth-cohn DE (b. 1935) |
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| ernst-otto onnasch DE (b. 1961) |
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| ernst-otto liebetrau Ph.D. Universität Dortmund 1972 |
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| ernst-otto meinhardt |
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| ernst-otto jakob |
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| ernst-otto maetzke |
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Rau, Balser, Becker, Kaiser, Kowahl, Kramme, Köhne, Peters, Disque, Disqué, Göhre, Janßen, Jalass, Jäger, Hansen, Müller, Schmidt, Schwedt, Freitag, Abercron, Petersen, Hoffmann, Schulz, Wurst, Weber, Wiehe, Muhl, Smit, Koch, Paul, Pahl, Jahn, Timm, Horn, Wolf, Menke, Schneider, Meyer, Klein, Dietz, Dumke, Lange, Jecke, Jeppe, Tabel, Theis, Heinz, Heuer, Mewes, and Früchtenicht