May I say this concerning the name: Aguirre:
Aguirre, I may have solve some of it, as in my Petit-Larousse (French dictionnary from France, known and greatly used in French-Canada and published in 1959), aguerrir is the verb: Accoutumer à la guerre which as I am translating it myself:
to accostom to war!! Wow, wow!!
And, you think it is Basque??
Hugs!