One of Snoopy's brothers was named Marbles.
I got a paper copy of a Peanuts strip featuring a marble game. Since I don't have a scanner set up I tried to look for it online and stumbled across that little factoid about Snoopy's brother.
Eneeeway ... I found a copy of the comic strip. June 29, 1952.
http://peanuts.wikia.com/wiki/June_1952_comic_strips