English: habitational name from Dilworth, a place in Lancashire
named from Old English dile ‘dill’ (a medicinal and culinary
herb) + wor{dh} ‘enclosure’.
Irish: English surname
adopted by bearers of the Gaelic name Ó Dubhluachra
‘descendant of Dubhluachra’, a compound of dubh ‘black’
+ luachair ‘rushes’.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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