The noble Spanish surname Riojas, is of toponymic origin, deriving from a place name where the original bearer resided or held land. The surname Riojas thus means "one who hailed from La Rioja."The region of La Rioja takes its name from the river Oja which flows through it. Over time, the Spanish word "rio," or "river," became fused with the name of the river, resulting in Rioja.
The surname Riojas was first found in the region of La Rioja, in Northern Castile.
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