Portuguese (Osório) and Spanish: from a medieval personal
name Osorius, of uncertain origin. It is perhaps a metathesized
form of Latin Orosius (Greek Orosios, a derivative of
oros ‘mountain’), the name borne by a 4th-century Iberian
theologian and historian, who was famous in Spain throughout the
Middle Ages.
Dictionary of American Family Names, Oxford University Press, ISBN 0-19-508137-4
54,884
Historical Documents & Family Trees with Osorio
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