Family name Langkjær (Langkjær 
) , throughout the world, is a rare cognomen. The cognomen Langkjær is characteristic of Northern Europe, particularly Denmark, where it is quite a rare surname, and Norway, where it is a very rare surname.
| VARIANT | COUNTRY |
|---|---|
| Langkjær | Denmark, Norway |
| hans langkjær Danish politician (1865-1942) (b. 1865) |
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| svend langkjær Danish athlete (1886-1948), DK (b. 1886) |
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| reidar langkjær Norwegian athletics competitor (b. 1952) |
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| niels langkjær researcher |
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| cecilie hostrup langkjær Danish association football player |
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| jakob langkjær |
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| lars svenné langkjær |
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Ib, Peter, Rikke, Gitte, Laura, Jakob, Jonas, Jeppe, Hanne, Helle, Felix, Martin, Magnus, Morten, Søren, Amalie, Casper, Kasper, Philip, Reidar, Dårde, Louise, Palle, Brian, Bente, Claus, Kim, Per, Pia, Jan, Tom, Maja, Sara, Sine, Anne, Kurt, Jesper, Gert, Jane, Jess, Tina, Tine, Nete, Inge, Mette, Simon, Signe, Staci, Lars, and Thomas