Cognomen Halkjær (Halkjær 
) , throughout the world, is a rare surname. The surname Halkjær is characteristic of Northern Europe, particularly Denmark, where it is quite a rare surname, Sweden, where it is a rare surname, and Norway, where it is a very rare surname.
| VARIANT | COUNTRY |
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| Halkjær | Norway, Australia, Denmark, United States, Sweden |
| laura halkjær kristensen DK (b. 1905) |
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| helge halkjær Danish rower, DK (b. 1916) |
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| erik halkjær Swedish journalist, SE (b. 1973) |
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| sofie ingdam halkjær researcher ORCID ID = 0000-0001-7518-4252 |
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| lila halkjær Danish taekwondoin |
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Mik, Mette, Msrie, Simon, Sofie, Stine, Claus, Bente, Brian, Karin, Karen, Peter, René, Rikke, Gitte, Lasse, Linda, Jacob, Jakob, Jette, Jeppe, Julie, Marie, Maria, Ulla, Vivi, Mia, Pia, Dag, Lis, Jan, Jon, Mark, Mads, Maja, Sune, Tanja, Kurt, Dina, Lars, Lene, Lone, Tony, Tove, Nils, Erik, Emil, Emma, Poul, and Nanna