OSA, and OSSA there are three houses with this name in Elorrio (Bizkaia), and also a palace in the same village, so your family's origin would be this village. There were branches of this family in Gipuzkoa, in Bergara, Deba, Azkoitia and Azpeitia. There are also a place named Osa in Navarra, in a village named Arze, and some authors think that this is the older origin (is not proved).

Meaning: is difficult to know, there are different theories, lets go with t= hem:

OTZA (read TZ like the italian ZZ, not exactly), means cool, in this case the meaning would be (the house in the) cool place

OTSOA: means wolf, but in the past was a common name used by many basque men, in this cas the meaning would be: The house of Otsoa.

Other theory says that the meaning is simply : place

I prefer the first theory: cool place, in Elorrio the people pronoun Otza the name I think that because of that they wrote OSSA with two S, and then in your branche one of the S was losed.

There are families with this name in many places of Bizkaia and Gipuzkoa, and also in Laburdi (Zibure), and Buenos Aires

There are also a lot of coats of arms

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