Dillon

English: habitational name from Dilwyn near Hereford, recorded in 1138 as Dilun, probably from Old English dīglum, dative plural of dīgle ‘recess’, ‘retreat’, i.e. ‘at the shady or secret places’.

Irish (of Norman origin): altered form of de Leon (see Lyon).

Irish: reduced Anglicized form of Gaelic Ó Duilleáin ‘descendant of Duilleán’, a personal name, a variant of Dallán meaning ‘little blind one’.

Jewish (eastern Ashkenazic): of uncertain origin; either an ornamental name from the Biblical place name Dilon (Joshua 15:38), or an altered form of Sephardic de León (see Lyon).