The information we have dating back to the 18th century, shows the surname KOSBAB originated from Stolp, Ostpreussen in Germany, now Poland. Still there are folks that believe Kosbab was not the original surname but a derivative of a surname possibly Kusibab, Kosbar or Kosbau.
What do you believe was the original surname and can you support it ?
PS: www.kosbab.org is back online!