Hi, my name is Javier Shiordia and live in Mexico City. It is very exciting to know about Siordias from around the world that are interested in their ancestry.
I know that I'm related to the Siordias because my great grandfather traveled from the Basque territory in Spain to Guadalajara, Jalisco where she met my great grandmother. They never married but had two sons (one of them my grandfather). My great grandmother and her sons emigrated to Mexico City. My grandfather never knew his father.
I don't know how it went from Siordia to Shiordia.
I will investigate for names and dates and post them when I get them.