Ola Luis!
It's nice to hear from you. I think I have also corresponded with member of the other side of your family. I recall corresponding for a time with some one from Mexico as well.
My family line is from the Philippines. I have researched and found a good number of Eraña's in Spain near Bilbao and from what the other Spainiards tell me the surname is quite prevalent in Basque countyside.
Very interested to see if we can put some more names into the family tree! I am hoping to interest someone from Spain in the search!
Look forward to more correspondence!