The name Dahl means Valley and is of Scandinavian origin. Dahl is name that's been used by parents who are considering unisex or non-gendered baby names--baby names that can be used for any gender.
Originally a Scandinavian surname used for families that lived near a valley. Roald Dahl, author.
Scandinavian surname spelled Dal or Dahl. Roald Dahl, author.