Cognomen Thorlacius (Thorlacius 
) , in the world, is a rare surname. The last name Thorlacius is characteristic of Iceland, where it is quite a common surname, Denmark, where it is quite a rare surname, and Canada, where it is a very rare surname.
| VARIANT | COUNTRY |
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| Thorlacius | Iceland, United States, Canada, Denmark, Chile |
| hallgrímur jónsson thorlacius (b. 1680) |
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skúli thorlacius (b. 1741) |
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børge thorlacius Danish theologian and philologist, DK (b. 1775) |
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| ólafur thorlacius (b. 1762) |
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| guðrún thorlacius IS (b. 1879) |
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| sigurður thorlacius (b. 1900) |
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guðni thorlacius jóhannesson President of Iceland (2016-present), IS (b. 1968) |
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| ólafur þór thorlacius icelandic multi-sport athlete, IS (b. 1936) |
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| alice thorlacius Danish actress (b. 1949) |
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| steinunn thorlacius researcher |
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| henrik thorlacius researcher |
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| theodora thorlacius researcher |
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| lárus thorlacius Ph.D. Princeton University 1989 |
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| linnea thorlacius researcher |
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| laurel thorlacius researcher |
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Mr, Korri, Klavs, Paula, Peter, Dosha, Gylfi, Lotte, James, Esben, Karin, Ethel, Eggrún, Halla, Frank, Friã, Mariam, Marino, Magnus, Sandra, Salvor, Einar, Shelby, Brian, Andri, Sue, Don, Jan, Jon, Mary, Anna, Kris, Guã, Lois, Carol, John, Teri, Eric, Faye, Wade, Zach, Uffe, Marie, Magns, Svala, Jeff, and Sigrã