Information on naming traditions can be found on the Azores Genweb here: http://www.rootsweb.ancestry.com/~azrwgw/naming.html
As for an out of wedlock child, you might find a legitimatization if you are real lucky. If not, it could be the surname of his godparents, his adoptive family, a prominent family, who knows. Cheri Mello Listowner, Azores-Gen Researching: Vila Franca, Ponta Garca, Ribeira Quente, Ribeira das Tainhas, Achada -- To unsubscribe from this group, send email to azores+unsubscr...@googlegroups.com. Follow the confirmation directions when they arrive. For more options, such as changing to List, Digest, Abridged, or No Mail (vacation) mode, log into your Google account and visit this group at http://groups.google.com/group/Azores. Click in the blue area on the right that says "Join this group" and it will take you to "Edit my membership."