Hi!
This is the origin of Eraña family.
In the north of Spain, near San Sebastian, there is a town known as Aretxabaleta (close to Mondragon).
In Aretxabaleta you can find a small group of houses known as Otala, and one of them is the Eraña Tower House (a middle age small castle).
So, all the Erañas in the world are relatives...ok, remote relatives but a family in some way.