Actually Pat was only in the early seasons of Happy Days (not counting a few guest appearances later on), and Arnold's was not named after him, he took over the place and kept the name, and people started calling him Arnold.
"I'm going to go do something productive. I'm gonna go watch television." - Ray Peterson, The 'burbs
"I am the literary equivalent of a Big Mac and Fries." - Stephen King
"There's nothing wrong with G-rated movies, as long as there's lots of sex and violence." - Elvira