Worldwide, Rantzau (Rantzau 
) is an extremely rare unknown gender first name. Much more frequently, Rantzau is the last name as well as the forename.
| VARIANT | COUNTRY |
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| Rantzau | Germany, Denmark, Poland, Australia, Spain |
| melchior rantzau (b. 1500) |
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| breide rantzau (1563-1639) (b. 1563) |
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| cai von rantzau (b. 1650) |
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| brede jensen rantzau NO (b. 1713) |
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| cai von rantzau German diplomat, DE (b. 1726) |
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| cuno von rantzau DE (b. 1864) |
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| lebrecht zu rantzau DE (b. 1890) |
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breido graf zu rantzau DE (b. 1949) |
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| countess caroline von rantzau (born 1962) (b. 1962) |
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| henneke henksen af rantzau, lord of neversdorp - 1464 |
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| cai godskesen af rantzau, lord of krummeendieg - Bef 1460 |
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| cai hansen 'gotskalk' af rantzau, lord of rantzowe - Aft 1377 |
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| kasper von rantzau, herr von nienhaus & schmoel 1485 - 1562 |
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| cai schacksen af rantzau, lord of panker - Abt 1486 |
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| henneke folmersen af rantzau - Aft 1419 |
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Mr, Peter, Gitte, Johan, Helle, Heino, Martin, Søren, Connie, Daniel, Louise, Josias, Johann, Marzena, Andreas, Bettina, Kasimir, Graefin, Johanna, Nicolai, Nikolai, Mathilde, Kimmi, Caroline, Karen, Berit, Ms, Mia, Sã, Jã, Stig, Anne, Anja, Carl, Paul, Ralf, Graf, Gina, Jens, Else, Erik, Hans, Otto, Marie, Sarah, Antje, Claus, Brian, and Birgitte