Cognomen Semadeni (Semadeni 
, Семадени 
) , around the world, is a rare family name. The last name Semadeni is characteristic of Switzerland, where it is quite a rare surname, Poland, where it is a rare surname, and Austria. Not in comparison with a country's population, the name is most common in Switzerland, the United States, and Poland. Much less frequently, Semadeni is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Semadeni | Poland, United Kingdom, United States, Mexico, Switzerland |
| Семадени | Russia |
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helena semadeni Polish teacher (1868-1948), PL (b. 1868) |
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władysław semadeni PL (b. 1865) |
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| antoni semadeni PL (b. 1823) |
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| bernard semadeni CH (b. 1827) |
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tadeusz semadeni PL (b. 1902) |
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| ryszard jakub semadeni CH (b. 1874) |
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| jon semadeni Swiss writer (1910-1981), CH (b. 1910) |
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| zbigniew semadeni Polish mathematician. Ph.D. Uniwersytet im. Adama Mickiewicza w Poznaniu 1959, PL (b. 1934) |
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| leta semadeni Swiss author, CH (b. 1944) |
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| francesco ottavio semadeni |
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Mr, Lila, John, Jean, Juan, Tino, Nate, Emma, Earl, Hank, Leta, Maria, Sarah, Susan, Steve, Andri, Aaron, Pablo, Peter, Randy, Robin, Marco, Leia, Gino, Gian, Ms, Ana, Amy, Kim, Ray, Jon, Tom, Ted, Marc, Mary, Mike, Sage, Alex, Anne, Beth, Beat, Kari, Paul, Reto, Rico, Dino, Debra, and Dario