Mine I named after my best friend, Bobby.
He named his rival after me in his games when he used to play.
I pretty much just continue on with the little tradition.
Plus, I used to write a fanfiction, and Bobby and I were always rivals in it.
So, it just kind of made sense.
But it's nice in D/P that they're friends, too, then it makes more sense to me in a real life sense.