As a child of the 90s, of course I knew about Yogi Bear. And it wasn't until I was in my 20s that I fully realized the guy who played baseball and said all those famous "yogi-isms" was Yogi Berra, a completely separate person. It wasn't until a friend was talking about yoga this morning that it hit me
a) Yogi probably wasn't Yogi Berra's real first name, but he may very well have gotten it for saying all those crazy zen-like things (such as "It's not over until it's over" or "half of the game is 90% mental"), and
b) it's probably not a coincidence that "Yogi Berra" and "Yogi Bear" sound so similar. Seeing as that was kind of the fashion in cartoons and all.
Oddly enough, I was recently reading a correspondence on a completely different forum, about the Yogi Bear / Yogi Berra question. General consensus there, was that it's got to be be that -- name-wise at least -- the baseball player provided some inspiration re the cartoon bear. It was learnt that Berra's real forenames are Lawrence Peter (apparently, by the way, he's still alive); reputedly, the nickname "Yogi" came from some friends who thought he looked like a Hindu yogi from a movie.
According to Wikipedia: in early days for Yogi Bear, his creators -- the cartoon film makers Hanna-Barbera -- were sued for defamation, by Berra. "H-B's management claimed that the similarity of the names was just a coincidence. Berra withdrew his suit, but the defence was considered implausible, and sources now report that Berra was the inspiration for the name."
The Wiki item gave a wonderful Berra-ism which I'd never encountered before: "Always go to other people's funerals, otherwise they won't go to yours."
(I'm wondering now whether Yoda in "Star Wars", owes at least something to this overall vein of inspiration.)