Board Thread:Questions and Answers/@comment-165.155.196.14-20130529162632/@comment-1739368-20130529232250

Regardless of Araki's fascination with music, he clearly states that the inspiration for Jonathan's name comes from said restaurant. I'm not sure which website you're looking at, but Jonathan's restaurant has been around since the 80's; Araki stating that he and his editor visiting the place before JoJo's was created would not make sense if the restaurant didn't exist since then. If anything, 2005 is probably when the website was created or when they changed the name to "Coffee and Restaurant", since it was originally Jonathan's Cafe until they changed it to be more family oriented.

Even if Get Back was a namesake, it's the namesake for JoJo, not Jonathan's name specifically.