Dahlia /dah-lia/ [3 sylls.] as a girls' name is pronounced DAL-yah. It is of Swedish and Scandinavian origin, and the meaning of Dahlia is valley. Also the flower named for 18th-century Swedish botanist Anders Dahl.Kreatif forms: Daihlia, Dehlia, Dohlia.ahlia /dah-lia/ [3 sylls.] as a girls' name is pronounced DAL-yah. It is of Swedish and Scandinavian origin, and the meaning of Dahlia is valley. Also the flower named for 18th-century Swedish botanist Anders Dahl. Kreatif forms: Daihlia, Dehlia, Dohlia.