Where did your last name Rivera come from?

The Rivera surname can be traced back to Gonzalo López de Rivera, Lord of the Castle of Rivera in Galicia in the 1200's. Some sources, however, claim that the Riveras are direct descendants of Sancho Belloso, natural-born son of the King of León, Ramiro III. Others, that the name dates back to ancient Roman times.

Source: Instituto Genealógico e Histórico Latinoamericano