From what I have found the "velho" started in Portugal. Curvelo in Brazil and Curvello and Curvelho in Hawaii.
I have traced my lineage from Curvelo in Aragon Spain to the Azores Islands. There the Curvelo went to the Canary Islands and became Curbelo. When they came to San Antonio some stayed Curbelo some became Corbello. When they came to Louisiana Some stayed Corbello some became Courvelle.
Have you been to the Carvajal Genealogy Project?
Have you seen any of my post on the Carvajal/Carbajal project?http://www.rogerlouismartinez.com/gen/carvajal_genetics.html
Please dig through the site and let me or Roger know if we can help you with any information.