James Bookhout is not referred to as "Jim" in references by researchers. I'm not saying that he was never called "Jim". Perhaps in his personal life he was always called "Jim". But, in referring to him, in his role as an FBI Agent who interrogated Oswald, he is always referred to as James Bookhout- by researchers, and in the years that I have been ferreting official documents, I have always seen him referred to as James Bookhout or James W. Bookhout. This is from his Warren Commission testimony:
Mr. STERN - State your name, please.
Mr. BOOKHOUT - James W. Bookhout. Do you want my home address?
Mr. STERN - Yes.
This is, in contrast, for instance, to Fritz being referred to as "Will Fritz"- by just about everybody.
So, I think it behooves researchers to stick with James when referring to him. That's what I am going to do, and it's what I expect others to do- the Punk's punkery notwithstanding.