Names

Until this morning, a character in my story was called Bob. I'm not sure why that was his name, as it's not a name I'm overly fond of, but it's been his name for nearly two years now and I'd sort of grown accustomed to it. But it didn't sit perfectly with me. When I hear the name "Bob" in real life, it brings about connotations I don't associate with my character. I'd sort of invested him with an "alternate Bob-ness", but of course a reader wouldn't get that. Readers have indicated this. And so this morning, with just a click ("change-all"), Bob became John. I am interested to see how this change alters my story, and how his new name changes his character. What elements will the fact of John-ness bring?