Meaning and history
From Old Irish Ness, of uncertain meaning, Neasa is a figure in Irish legend as the mother of Conchobar. She helped make her son king of Ulster by persuading Fergus mac Róich, her husband and Conchobar’s stepfather, to give him the throne for a year and then supporting him so effectively that the Ulstermen wanted him to remain king. Some versions say she was first called Assa, meaning “gentle,” and later renamed Ní-assa, “not gentle,” after seeking revenge for the murders of her foster fathers.
In 2008, 5 babies were recorded with the name Neasa, ranking #17,504 among girls.