Meaning and name origin
Petronilla \p(e)-tro-nilla, petron(il)-la\ as a girl's name is of Greek origin, and the meaning of Petronilla is "rock". Petronilla is a variant of Petra (Greek): feminine variant of Peter. A girls' name which is little-used.
Petronilla is not a popular first name for females and an equally uncommon surname or last name for all people (Source: 2000 U.S. Population Census).
Displayed below is a comparison of the popularity of the girl name Petronilla and its source form. The only popular variation form ranked in the Top 1000/100 is Petra. (Source: 2014 Birth Name Statistics).
Petronilla is also pronounced similarly to Petronela, Petronella, Petronelle and Petronille. Other suggested similar baby names are Petronia and Petronija. Like Petronilla, these names are not commonly used.