As to my dad having two "last" names, when I was a little kid, my folks were friends with another couple, and the guy had two "first" names. The four of them used to say the dads should trade a name to each other - the other family had a daughter who was my age, so we were most often present at dinners, porch gatherings, etc - and they'd spend an inordinate amount of time discussing the combinations and which they liked and didn't like and it would lead to laughs and more drinks and more laughs.
I'm just glad their propensity to drone on and on about inane, meaningless topics didn't get passed on to me.
EDIT:
If you count their middle names, my dad had three "last" names and the other guy had three "first" names. Fascinating stuff.