Aguiar is a toponimic name, which means it was taken from a place name. Aguiar means "place where the eagle perch", and it has no relation to the name Aguilar. Aguiar is originally from the Galicia region of Spain. Because of hardships of the land, many gallegos where forced to immmigrate to many parts of the world. Cuba was a choice spot because of its strong econommy, as well as the Canaries. The language the gallegos speak is related to portuguese, thus there are any brazilian Aguiares. My own father's family came from the Canaries, but their ancestors where gallegos. if you need more info e-mail me at firstname.lastname@example.org. hope you learnedsomething, and i know more if you need!