English (Yorkshire): habitational name, probably from Mosbrough
in South Yorkshire, recorded in Domesday Book as Moresburh,
from Old English mores, genitive singular of mor
‘marsh’, ‘fen’, ‘moor’ + burh ‘fortress’.
Norwegian:
habitational name from any of several farmsteads in southern Norway,
so named from Old Norse mós (genitive case of mór
‘sandy plain’) + býr ‘farm’.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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