Galician: topographic name from Mero, a river in Galicia.
Spanish and Catalan: probably a nickname from mero
‘grouper’ (the fish).
Italian: possibly from mero
‘pure’, ‘sheer’ (Latin merus). Theoretically, this could also
be a source of the Spanish name, but in any case it is difficult to
explain its application.
Hungarian (Méro):
occupational name for someone who worked with scales, from
méro ‘measure’, ‘measurer’, a noun derivative of
mérni ‘to measure’.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
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