Erna \e-rna, er-na\ as a girl's name is of Old Norse origin, and the meaning of Erna is "capable". Mythology: name of the wife of the demi-god Jarl. Also nickname for Ernestine.

Erna has 2 variant forms: Ernaline and Ernalynn.

Baby names that sound like Erna are Arna, Erina, Erena and Orna.