Extended spelling of Marian, reinforcing the association of the second element with Ann(e). It also represents a French assimilated form of Mariamne. Marianne is the name used for the symbolic figure of the French Republic.
English and Scottish: patronymic from the medieval personal name Nel or Neal, Anglo-Scandinavian forms of the Gaelic name Niall (see Neill). This was adopted by the Scandinavians in the form Njal and was introduced into northern England and East Anglia by them, rather than being taken directly from Gaelic.