Family name Kastberg (Kastberg 
) , across the world, is a rare cognomen. The last name Kastberg is characteristic of Northern Europe, particularly Denmark, where it is quite a rare surname, Sweden, and Estonia, where it is a rare surname. In absolute terms, it most frequently occurs in Denmark, Sweden, and the United States. Very seldom, Kastberg is the forename as well as the last name.
| VARIANT | COUNTRY |
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| Kastberg | Germany, Sweden, United States, Denmark, Brazil |
| jonas kastberg SE (b. 1757) |
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| stig kastberg (b. 1924) |
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| anders kastberg researcher (b. 1963) |
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| jens kastberg Danish rower (b. 1975) |
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| signe e. kastberg Ph.D. University of Georgia 2002 |
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| michael kastberg (b. 1977) |
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| rasmus kastberg |
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| peter kastberg |
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Mr, Dick, Lars, Leif, Lina, Line, Lisa, Lone, Lynn, John, Jens, Todd, Tina, Tine, Nils, Noel, Eric, Erik, Erin, Emma, Hans, Inge, Dale, Dave, Ruth, Ross, Ms, Bo, Sã, Ann, Ane, Amy, Lee, Jan, Jam, Fã, Orla, Ida, Matt, Mads, Maja, Anna, Anne, Carl, Kyle, Pete, Povl, Rose, Ora, and Åsa