Around the globe, Karl-Ernst (Karl-Ernst 
) is quite a rare boy's first name. The first name Karl-Ernst is characteristic of Western Europe, particularly Germany, where it is quite a rare boy's name. Parts of the name also exists independently as a first name Karl, and a first name Ernst.
| VARIANT | COUNTRY |
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| Karl-Ernst | Germany, Spain, France, United States |
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karl-ernst schmidt German farmer, DE (b. 1949) |
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| karl-ernst schroeter German U-boat commander, PL (b. 1912) |
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| karl-ernst hockemeyer (b. 1907) |
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| karl-ernst petzold German historian of antiquity, DE (b. 1918) |
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| karl-ernst stumpf (b. 1909) |
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| karl-ernst maedel German journalist and author, DE (b. 1919) |
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| karl-ernst kaiser German navy officer and WWII submarine commander, DE (b. 1920) |
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| karl-ernst wohlfarth-bottermann German cell biologist (1923-1997), DE (b. 1923) |
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| karl-ernst sasse German composer and conductor, DE (b. 1923) |
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| karl-ernst eschebach German politician (1924-2003), DE (b. 1924) |
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| karl-ernst jeismann German historian (1925-2012), DE (b. 1925) |
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| karl-ernst lober German politician (1927-2008), DE (b. 1927) |
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| karl-ernst schenk Karl-Ernst Schenk; prof. emeritus, U. of Hamburg and dir., "Institut für Integrationsforschung", Europa-Kolleg Hamburg, Germany, DE (b. 1929) |
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| karl-ernst gollwitzer German judge, Federal Court of Justice, DE (b. 1931) |
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| karl-ernst schottes German athletics competitor, DE (b. 1935) |
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Mohr, Müller, Siepmann, Stübel, Schmidt, Schnorr, Kusanke, Krüger, Kröger, Küpper, Richter, Döring, Timpner, Noehles, Neumann, Hartwig, Fischer, Albrecht, Dietrich, Herrmann, Overdick, Schneider, Oerter, Franke, Hühne, Goerke, Beck, Koch, Kiel, Roos, Jung, Horn, Otto, Meyer, Stahl, Kegel, Ackermann, Klein, Reiß, Wilde, Sachse, Sippel, Schulz, Adolph, Becker, Kaiser, Kleine, Rübel, Knapp, and Zimmermann