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.
German: 1. Nickname from Old High German blanc ‘bright’, ‘white’. 2. From Middle Low German plengen ‘to stir’, ‘bring about strife’, ‘deceive’, hence an unflattering nickname for a troublemaker. 3. German and Danish: unexplained.