I am of Portuguese descent (and learned recently I can't become citizen because my Portuguese grandpa died when my father was a child :/) I have two first name

I am of Portuguese descent (and learned recently I can't become citizen because my Portuguese grandpa died when my father was a child :/) I have two first names, two last names, and filho (means "son"). I have yet to find any system that understand my name properly, even in Brazil where I had official documents with my name butchered in one way or another. (Nevermindt people assuming the last name was literal last name and insisting in calling me Mr. Filho, something that doesn't make sense)