In the world, Carl-Otto (Carl-Otto 
) is a rare male first name. The first name Carl-Otto is habitual in Western Europe, particularly Germany, where it is a rare masculine name. Very seldom, Carl-Otto is the last name as well as the forename. Parts of the name also exists independently as a first name Carl, and a first name Otto.
| VARIANT | COUNTRY |
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| Carl-Otto | Norway, Sweden, Spain, Germany, Denmark |
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carl-otto elliot (b. 1875) |
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| carl-otto bragnum (b. 1891) |
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| carl-otto lütkens German politician, DE (b. 1903) |
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| carl-otto von martius (b. 1912) |
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| carl-otto ruebartsch (b. 1915) |
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| carl-otto segerdahl Ph.D. Stockholm University 1939 |
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| carl-otto schell researcher |
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| carl-otto ottosen researcher |
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| carl-otto leiber physicist |
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| carl-otto falck burum badminton player (b. 1989) |
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| carl-otto peitschner |
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