The Bronatowski surname can be traced to 18th century Poland. The earliest recorded mention is Anton Bronatowski, a copper engraver who contributed an engraving of the Virgin Mary to the cover of "Corona Gratitudinis" by Elias Samnocki in 1739.
There are two families that carry the surname Bronatowski -- one family, largely Catholic, is primarily located in Torun, Poland. The earliest mention of a Bronatowski in the Torun area is Albrecht Brunatowski, whose daughter, Francisca, was born in 1826. The origins of the Bronatowski family in Torun prior to 1826 is unknown, although there is a record of a Staff Captain Broniatowski (Бронятовский) who served in the Russian army as adjutant to Lieutenant General Prince Scherbatov in the Kostroma Infantry Regiment, which participated in the Siege of Torun in 1813.
A second family is primary located in Czestochowa, Poland. Prior to 1823, this family's last name was variously record as Brun, Bron, Bru, Brau, or Braun. In 1823, the family's name appears in records as Bronatowski, perhaps as a combination of Bron and Natowski, the surname of the husband of Laja Brau, who was one of the family's earliest recorded members. In the 1860s, the spelling of the Czestochowa family's name was changed to Broniatowski. The Broniatowski family is primarily of Jewish origin.