Surname Fahlin (Fahlin 
) , globally, is a rare last name. The surname Fahlin is habitual in Sweden, where it is quite a rare surname, Finland, where it is a rare surname, and New Zealand, where it is a very rare surname. In absolute terms, it most frequently occurs in Sweden, the United States, and Finland. Much less frequently, Fahlin is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Fahlin | Philippines, Finland, Sweden, United Kingdom, United States |
| carin fahlin Swedish university teacher (1900-1964), SE (b. 1900) |
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| ole fahlin Swedish aviator, SE (b. 1901) |
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emilia fahlin Swedish road racing cyclist, SE (b. 1988) |
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| roland fahlin SE (b. 1938) |
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| roul fahlin Swedish bicycle racer, SE (b. 1966) |
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Mr, Sanna, Sarah, Susan, Sofia, Scott, Carla, Katie, Kalle, Klara, March, Peter, David, Linda, James, Johan, Joyce, Julie, Elena, Erica, Hanna, Debby, Marie, Isak, Eive, Bob, Kim, Dan, Eva, Zul, Mary, Mark, Sara, Alex, Anna, Bill, Paul, Roul, Lars, Leif, Lynn, Josh, John, Joan, Elin, Ella, Faith, and Fiona