Last name Birgen (Birgen 
) , around the world, is quite a rare cognomen. The cognomen Birgen is habitual in Luxembourg, where it is quite a rare surname, Kenya, and Turkey, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in Kenya, the United States, and Luxembourg. Very seldom, Birgen is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Birgen | Kenya, Luxembourg, United States, Belgium, Turkey |
| muhittin birgen politician, TR (b. 1885) |
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bethwell birgen Kenyan middle-distance runner, KE (b. 1988) |
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| birgen keleş Turkish politician, TR (b. 1939) |
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| birgen keşoğlu Turkish diplomat, TR (b. 1948) |
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| birgen keleş TR (b. 1939) |
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| john birgen Kenyan athletics competitor, KE (b. 1974) |
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| mariah birgen Ph.D. University of Michigan 1997 |
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| şeref birgen Turkish sports sailor, TR |
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| brian joseph birgen Ph.D. University of Michigan 1997 |
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| birgen haest researcher |
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| beatrice j birgen researcher |
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| cansu birgen researcher (ORCID 0000-0002-8176-6758) |
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| dilek birgen |
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Mr, Rose, Rita, Ruth, Dawn, Greg, Leah, John, Joan, Joel, Rabi, Jean, Judy, Tina, Nash, Noel, Esat, Omer, Maria, Marty, Mercy, Jeff, Paul, Kaan, Bill, Ali, Ben, Ken, Kip, Pat, Deb, Dan, Joe, Tim, Naz, Nur, Eva, Marc, Mary, Mark, Memo, Mike, Muge, Arif, Arzu, Amon, Merve, and Melis