The name Curzon is said to derive from Courson, Normandy, either the Courson SE of Coutances or Notre-Dame-de Courson near Lisieux.
Geraline/Giraline de Curzon, however, is said to have been of Breton; feudal Lord of Locking, Berks, and Fishead, Oxon, at the time of the Domesday Survey 1086; had [Hubert], with an elder son (Robert, held land 1086 at Uggeshall, Staffs, of Hugh, Earl of Chester; ancestor of the French branch of the family). [Burke's Peerage]
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Curzon: Notre-Dame-de-Courson: Calvados, arr. Lisieux, cant. Livarot.
In 1086 Hubert held West Lockinge, Berkshire, of Henry de Ferrers. In 1135 a Hubert de Curcon held three knights' fees of the honour of Ferrers, of which his 'nepos' Stephen held two in 1166; and Richard de Curcon held four fees of the same honour in 1135, which were held by Robert his son in 1166. Courson was a fief of the Norman barony of Ferrieres according to an "aveu" of 1604. In 1223 Hubert de Courson was seigneur of Courson. [Origins of Some Anglo-Norman Families]
Note: The information given by "Orgins" is completely compatible with Burke's, but other than the Hubert of 1086, all of the other people mentioned are brothers & cousins of the descent which contains my direct ancestors, according to Burke's Peerage.
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A Breton; Feudal Lord of Locking, Berks. and Fishead, Oxfordshire.