of Irish origin from the Gaelic Ó Donndubhartaigh.
of Anglo-Norman origin: de avesne port, where avesne is derived from Frankish avisna ("field" see:Wiese).
Any of a number of places in the English-speaking world:
Origin
As an English surname, from Old English Devennport, named after the River Dane + port. The first element is from Welsh dafn ("trickle, drop"), ultimately from Proto-Indo-European *dʰewh₂- ("mist, haze").
As an Irish surname, from Ó Donndubhartaigh, which is from donn + dubh + artach; see airigh.
Modern English dictionary
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