Welsh: habitational name from any of the numerous places in
Wales, in particular the one near Denbigh, so named from Welsh
tre(f) ‘homestead’, ‘settlement’ + a mutated form of
mawr ‘large’.
Irish: reduced Anglicized form of Gaelic
Ó Treabhair ‘descendant of Treabhar’, a byname
meaning ‘industrious’, ‘prudent’.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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