I concur with Mar's link ...I'd only add that I think all 'Hoffman's' come from "hoof" + "man" whereas hoof designates a farm with animals.
By the way, the Baronkiewicz looks like a Slavic version of Baron which you can find info on at:
http://www.ancestry.com/learn/facts/fact.aspx?&fid=10&fn=&ln=Baron
The suffix is definitely a diminutive denoting "son of" of "little" or some such relation. There may be a middle syllable that means something, but I'm not sure. Perhaps one of posters with more knowledge of Slavic names might chime in ...