Last name Langkjaer (Langkjaer 
) , across the world, is a rare surname. The family name Langkjaer is habitual in 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 |
|---|---|
| Langkjaer | Sweden, Norway, Spain, United States, Denmark |