Could mean "the red one", referring to a family with red-haired or pink complexion-ed ancestors, could mean "of water" since the old french word for water was "reau", meaning the family lived near water, or could be linked to the french river, the Reau.
Lareaux הגייה עם משמעויות, מילים נרדפות, הפכים, תרגומים, משפטים ועוד