Comment by nmd

Spain has an interesting system here, a person born into a Spanish-speaking family is given a first name followed by two surnames, the first being the father's family name (or, more precisely, the surname he gained from his father) followed by the mother's family name (or, again more precisely, the surname she gained from her father).

Or in your example:

Gen X: FirstName P1-First-LastName P2-Second-LastName