Anybody know what the actual fuck is going on here? This field is apparently mandatory and I have no idea what the fuck to put in there. (It's online check in for a hotel in Spain I will be stying in next week).
@llamasoft_ox
Spanish:
The 2 first names then father's last name, then mother's maiden last name.
You probably can get around by entering you mother's last maiden name on it.
Some American software I have seen used to ask for "Mother's maiden name" because all the Iberian and descendants. 
Just for trivia Portuguese is the other way around. The first last name is the mother's maiden the last name and then the father's. I guess our cultures really want to make sure of our family origins. 