Ravilla is a last name or family name of a family in South India, it may called as RAVILLOLU in Andhra Pradesh state, RAVILLO in other states like Tamil Nadu, many people saying one old story that "RAVILLA name was given by the South Indian King for strong and brave person, he conducted physical strength test and mental strength test, and found result as more strong in physical and very brave, so KING started using these people in may be fields suitable for good long term planners & medium time decision maker and named them as "RAVILLA".
As far as we know, Ravilla family members are from Tamil Nadu, Andra Pradesh, Karala, Karnataka. Most of them belong to mid-higher caste like Naidu or Chowdary caste.
References
Ravilla Wikipedia(Text) CC BY-SA