English form of Mariamne, the earliest reference to whom is to the wife of Herod the Great.
In English Marianne is also an extension of Marian/Marion and, as in French, formed by the elision of Mary/Marie and Anne/Anna.
In Scotland the use of the separate names, Mary Ann[e], is more common. The 1841 Census of Aberdeenshire has the separate names over 20 times more frequently than the combination although both forms are quite popular.
In old documents in Latin, Marianna is used, with appropriate case endings, for Marianne.
Also one of a large number of Dutch and Flemish variants of Maria [q.v.].