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 and Araki stating that he and his editor visited the place before JoJo's was created would not make sense if it didn't exist since then. If anything, 2005 is proubably when the website was created.

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