Italian and, more recently, English form of Eleanor [q.v.]. May be recorded as Helenora, of which there were a few records in the 1841 Census of Aberdeenshire. Also in author's family tree.
Alianora was used as a Latinised version of Eleanor/Eleanora in many old documents. Search on Alianor* to take account of Latin case endings.
Note that Ellen and Helen often appear in old documents in Latin as Elena or Helena; however, it is also possible that they may be recorded as Eleanora or Elinora. Care should be also taken when searching these old documents to note the appropriate Latin case endings.
A private communication [JS] notes an unusual short form Elnora in the 1881 Census of Scotland.