I would go with Chic-a-Bob. Just kidding. Nothing wrong with Chicago Bob. Bob Poznanovich is good too.
Other Ideas;
Bob Pozno
Bob Pozna
Bob Nanovich
Bob Whatabout
Bob Ingforapples
Bob 'itchin'
or just plain old Bob.
Okay, I'm being silly. But, I don't think it really matters all that much. The quality of your music will make your name into something. I don't think it works the other way around. That's just my opinion. I heard Dave Grouls say if he thought his band was gonna become something big he wouldn't have called it Foo Fighters. Pink Floyd is a really dumb name for a band. Arnold Dorsey wasn't a bad name for a vocalist but he changed to Engelbert Humperdinck. I think he would have done just fine with Arnold Dorsey. But, I myself go by my first nickname and my middle name. Toby Nathan. As far as performing music goes I don't use my last name until it's necessary. That's because it was getting old having people speak to me in Polish with an expectation that I might understand them. That, and too many people trying to pronounce my last name properly and fouling it up for 3 - 4 minutes while asking me if they got it correct. Then, way too many conversations about what part of Poland I came from, if I've ever been there, or if I'm related to so and so ...ski or so and so ...ski or so and so ...ski.
So, I save my last name for when they are writing a check. Then I just show my ID and let them figure it out from there.

Does the noise in your head bother me ?