Amaurie (ou Maurice) d'Estouteville

[AMAURIE d’Estouteville . Morandière states that "Robert I le vieux d’Estouteville et son autre sœur Amaurie ont épousé Blanche et Alain, enfants de Guéthénoc Sire de Rieux" (who he says was descended from a younger son of Alain I Duke of Brittany, who died in 907) but cites no primary source on which the information is based[261]. m ALAIN Seigneur de Rieux, son of GUETHENOC Seigneur de Rieux & his wife ---.] fmg Medlands https://fmg.ac/Projects/MedLands/normacre.htm#_Toc492794591''

Charles Cawley identifies this person as Amaurie. The Dictionary of the Nobility identifies this person as Maurice. The journal Notes and Queries from 1870, had an intriguing article discussing the name Elmore and its derivations; following is the discussion in part: ELMORE (Ph S. vi. 231.)—This word and its cognates may be either Saxon or Celtic. If the former, its meaning will be simply very great; if the latter, it is a member of a large family, the relationship between whose members are not always recognized. Almaric is a common medieval name, looking at first sight Saxon, but on closer inspection, it reveals itself as Celtic. In legal Latin, it becomes Almaricus, with the feminine Almeria: in French proper its form is Amaury (dropping the c): in Breton French it drops the Al, becoming Meric; while in England it was naturalized as Almore or Elmore. The addition of "poor letter H” according to our island fashion, makes it Helmore. And since in our earliest state records we find Amaury and Maurice used interchangeably for the same person, it seems extremely probable that Maurice is but a softened form of Meric, and has no connection, as is generally supposed, with 'Mauritius.

So it is that these two resources confirm each other.