Leonilla is a feminine given name of Latin origin, derived from the male name Leo, which itself comes from the Latin word 'leo' meaning lion. The name gained popularity during the Middle Ages in Europe, often used as a shortened form of names like Leonora or Leopoldina. It fell out of favor by the late 19th century but has seen a resurgence in recent years, particularly in some European countries and among those with an interest in vintage or unique names.
"Leonilla saw its peak popularity with five births each in 1919 and 1923, totaling ten babies named Leonilla during those years."