Meaning and history
Germanic short form of names containing ern, "serious" or "resolute," or possibly from arn, "eagle." Norwegian politician Erna Solberg (1961-), who served as Prime Minister of Norway from 2013 to 2021, is a notable bearer.
Erna rose from #995 to #864 for girls between 1941 and 1942. Its highest annual birth count came in 1916, with 358 births.