The english Version Of Bronislawa Is Bernice and Bertha,so i guess Bernise gave the polish or true version Of her Name as the mother On The death certificate or Thomas Did.So If This is your Thomas And Bernice(Bronislawa)then You now have Her Maiden Name and real polish First Name.

Ontario, Canada, Deaths, 1869-1938 and Deaths Overseas, 1939-1947
Name: Baby Nowak
Death Date: 12 Dec 1932
Death County or District: Waterloo
Gender: Female
Birth Location: Galt Hospital
Father: Thos Nowak
Place of Birth:Poland
Mother: Bronislawa Sierakowska
Place of Birth:Poland
Township:Preston
Adress:206 Montrose St.