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This concept maybe need an explanation for english talkers. I know in many countrys people are called only by First Name and Last Name, wich usually is the Last Name of the father. But in Spain we use the ones for the father and mother, usually in that order (ej: father: bill murray sanders, mother: sarah hancock williams, you James Murray Hancock).

So we here basically used the second last name as an identification of hunter level instead of an hereditary last name.