 As fixed spellings of surnames was not yet common practice in his time, du Casse's surname has a variety of different spellings.The spelling of "du Casse" is from his birth record, but other records show "Ducasse", "Ducas", and "Du Casse".His grand-nephew, Robert, who wrote a biography of Jean-Baptiste in 1876, spells both his great-uncle's and his own as "du Casse".