Family name Illgen (Illgen 
, Ильген 
) , around the globe, is quite a rare last name. The last name Illgen is habitual in Germany, where it is quite a rare surname, the United States, where it is a very rare surname, and Kyrgyzstan. Not in comparison with a country's population, it is commonest in Germany, the United States, and Argentina.
| VARIANT | COUNTRY |
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| Illgen | Germany, Spain, United States, Argentina, France |
| Ильген | Kyrgyzstan, Russia |
| christian friedrich illgen German Protestant theologian (1786-1844), DE (b. 1786) |
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karin illgen German discus thrower, DE (b. 1941) |
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| arthur illgen German politician (1905-1943), DE (b. 1905) |
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| ernst illgen (b. 1900) |
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| hans illgen DE (b. 1905) |
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| otto illgen (b. 1915) |
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| konrad illgen DE (b. 1922) |
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| klaus illgen badminton player, DE (b. 1950) |
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| anita illgen Dr. rer. nat. Universität Leipzig 1977 |
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| johanne rosine illgen |
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| karin illgen |
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| andrea illgen DE |
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Mr, Rene, Rich, Gerd, Lisa, Jack, John, Joel, Judy, Juyn, Troy, Tino, Turu, Nico, Nick, Nina, Noel, Edna, Eric, Hans, Inge, Ines, Rolf, Irma, Ralf, Kyle, Ms, Al, Sam, Amy, Ken, Lai, Liz, Lia, Jan, Tom, Tim, Ian, Uwe, Marc, Mary, Sean, Sven, Alex, Anne, Karl, Kurt, Paul, and Ilse