Last name Dahl-Olsen (Dahl-Olsen 
) , all over the world, is a very rare cognomen. The surname Dahl-Olsen is characteristic of Denmark, where it is a rare surname, Norway, and Peru, where it is an extremely rare surname. Parts of the name also exists independently as a last name Dahl, and a last name Olsen.
| VARIANT | COUNTRY |
|---|---|
| Dahl-Olsen | Norway, United States, Peru, Denmark |
| gunnar dahl-olsen Faroese governor and politician, FO (b. 1899) |
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| gunnar dahl-olsen Faroese cyclist (b. 1965) |
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