I made my account just for this.
Well, this is *very* late and I don't even play KSP (Though I love watching people play it), In Looney Tunes' 1953 "Duck Dodgers in the 24 1/2th Century" cartoon., Duck Dodgers (Daffy Duck) says, while explaining how to get to planet X; "Starting from where we are, we go 33.600 Kerbal miles due up! [...]"
I wonder if this is just a coincidence, or had some influence into naming it, seeing as the whole episode is centered on the space adventures of Daffy Duck and Porky Pig.
Video for reference ( happens at 2:25 ):
