Ouilly is an element in several place-names in Calvados, Lower Normandy, France:
Ouilly-le-Vicomte Ouilly-le-Tesson Ouilly-du-Houley Pont-d'Ouilly
d'Ouilly is the origin of the English surnames d'Oyly and Doiley:
The D'Oyly baronets, a number of British baronetcies. Richard D'Oyly Carte, Victorian theatrical impresario
This surname is further given to:
D'Oyly Carte Island, an island in the River Thames, England. The doily, an ornamental table mat supposedly invented by a Mr Doiley