Cognomen Frohn (Frohn 
) , worldwide, is quite a rare last name. The last name Frohn is characteristic of Germany, where it is quite a rare surname, Denmark, and Netherlands, where it is a rare surname. Measured by absolute frequency, the name is most common in Germany, the United States, and Netherlands.
| VARIANT | COUNTRY |
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| Frohn | France, United States, Germany, Denmark, Netherlands |
| paul adolph frohn DE (b. 1679) |
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| ludwig vollrath frohn DE (b. 1735) |
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| konrad frohn DE (b. 1752) |
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charlotte frohn DE (b. 1844) |
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| nicolaas christian frohn Dutch photographer, NL (b. 1860) |
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| antonius franciscus josephus frohn Dutch photographer, NL (b. 1867) |
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| g. frohn Dutch photographer (1871-1910), NL (b. 1871) |
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| peter frohn (b. 1881) |
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| erich frohn DE (b. 1885) |
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| wilhelm frohn DE (b. 1900) |
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| robert frohn German historian, DE (b. 1913) |
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| h. josef frohn (b. 1907) |
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| werner frohn German manager and politician, DE (b. 1929) |
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| joachim frohn Dr. rer. pol. Freie Universität Berlin 1969 (b. 1941) |
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| arnold frohn (b. 1932) |
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