Derived form of D'Evreux / Devreux, meaning d'Évreux ("from Évreux", a town in Normandy, France), the surname is found frequently in Ireland, Wales and England and to a lesser extent elsewhere in the English-speaking world.
[3] In Ireland, the name is associated with Wexford, where the Cambro-Normans first invaded from Pembrokeshire, Wales in 1170.
[4] Dubricius is called Dubrice in French and Dyfrig would have given *Difry / *Dufry in French and *Difery / *Dufery in Anglo-Norman, and St. Devereux is probably a mistranslation after the surname Devereux.
The French variant is Devreux, which unlike Devereux is found within Normandy and France themselves.
[5] The similar names Devereaux and Deveraux are alternate spellings of the surname resulting from the various ways of pronouncing it – the placename is pronounced "Dev-ruh" (French pronunciation: [devʁø]), and the surname may be pronounced "Dever-o", "Dever-oo", "Dever-ooks", "Dev-erah", "Dev-rah", "Dev-ruh", or (in and around Wexford) "Dev-rix".