Many of these insulting occupational slave names were rooted in Anglo-Saxon/Nordic. It's hard to say for sure if this really did happen, but it seems to have been the case. I don't buy into this rather bizarre idea that blacks that were just freed would chose the surname of their slaveowners. Why the heck would anyone for that matter chose a surname of someone who enslaved them and made their life miserable and caused them so much anguish and pain?
If there are slave names it had to be occupational names given to blacks who were generations removed from their ancestors, and as a result didn't have knowledge of their last name and were given an occupational name, a very insulting one.