Hi I'm to are related to the Sias from New Mexico that was my grandmother's last name. Her father's name was Seferino Sias but that's all we know. I know the last name Sias is French that's what I have been seeing. I also thought that the name Sias was Spanish but seeing something otherwise. Have you been to Rootsweb there's alot of Siases from all over the country. Even tells the history of the name Sias which was originally spelled sieyes which is french. Please email me thank you.