Dagny \dag-ny\ as a boy's name (also used as girl's name Dagny), is a variant of Dag (Scandinavian), and the meaning of Dagny is "daylight".

The baby name Dagny sounds like Danny, Dagen, Dagan, Dagon, Dan, Dann, Dana, Dane, Dayne, Daine, Dain, Danya, Dani, Danno, Denny and Donny. Other similar baby names are Dabny, Dabney, Dago, Digby and Signy.