|Devalley||rare: Galway. Variant of Devilly, q.v.|
|Devilly||rare: scattered. Ir. Ó Duibhghiolla (dark attendant). There were two septs in Connacht: (1) Southern Uí Fiachrach,(2) Síol Anmchadha, both in Galway. Synonyms are Diffley Devally, Deely and Duffley. MIF.|
|Diffley||fairly rare: Connacht. Variant of Devilly, q.v.|
|Duffley||rare: Roscommon. Variant of Devilly, q.v.|
|Ó Duibhghiolla||Diffley, Devilly, Devalley: cuíosach annamh: Connachta, Gaillimh go sonrach. Dhá chlann: Uí Fiachrach theas; Síol Anmchadha. Brí: dubh + giolla. MIF.|
Parishes where Diffley and a second surname are found together
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