The English and Irish surname Dillon is of Norman origin derived  from the Germanic personal name Dillo introduced to Britain from France by the Normans. The name may also be of  habitational origin meaning someone from  Dilwyn near Hereford, recorded in 1138 as Dilun,  from the Old English term  diglum, meaning “recess, or retreat,” When found in Ireland the name Dillon is an anglicized form of the Gaelic name  Ó Duilleáin ‘descendant of Duilleán’, a personal name, a variant of Dallán meaning “ the little blind one.” They gave their name to Dillon's Country in County Westmeath, in the center of Ireland. The first recorded spelling of the family name is shown to be that of Geoffrey Dilun, which was dated 1203, in the "Select Pleas of the Crown", Shropshire.  

DILLON RAISED CREST RING