English and French: from the Germanic personal name
Dillo (of uncertain origin, perhaps a byname from the root
dil ‘destroy’), introduced to Britain from France by the
Normans.
English: habitational name from Dilwyn near Hereford,
recorded in 1138 as Dilun, probably from Old English
diglum, dative plural of digle ‘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).
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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