Family name Willius (Willius 
) , in the world, is a rare last name. The family name Willius is habitual in Bosnia and Herzegovina, where it is quite a rare surname, Austria, where it is a rare surname, and Germany. Measured by absolute frequency, it is commonest in Germany, Bosnia and Herzegovina, and Indonesia. Very seldom, Willius is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Willius | Bosnia and Herzegovina, Tanzania, Austria, Indonesia, Germany |
| christian willius (b. 1584) |
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| nicolas willius (b. 1709) |
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| wilhelm ludwig willius DE (b. 1726) |
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| fredrick willius American cardiologist (b. 1888) |
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| karl willius German fighter ace and Knight's Cross recipient (1919-1944), DE (b. 1919) |
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| charlotte willius German association football player, DE (b. 1989) |
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| emanuel willius DE |
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| lea willius German volleyball player, DE (b. 1999) |
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Mr, Ginger, Jeremy, Thomas, Edward, Hailey, Helmut, Werner, Matthew, Michael, Andreas, Charles, Beverly, Dominik, Gregory, Jessica, Jeffrey, Nicolai, Brunetta, Günther, Nicholas, Sebastian, Dieter, Darren, Ronald, Kelsey, Ms, Jan, Uwe, Marc, Ruth, Greg, Lois, Jens, Jeff, Sarah, Stephenie, Astri, Donna, Laura, Lioba, Janet, Jaime, Jonas, Horst, Felix, Sandra, Cheryl, Kevin, and Charlotte