Devereaux   French D'Evreux = Of Evreux Eure, Normandy
Deverell   English Deverel = the Slope or Nook of the River Dever
Devereux   French D'Evreux = Of Evreux Eure, Normandy
Deverill   English Deverel = the Slope or Nook of the River Dever


That is from a genealogy site..

But I think I have seen it also spelled differently. I have also read what caused them to leave France but I can't remember. There are lots in what is now COunty Offaly but was King's. mg