Pet Names are so special and one can't detach such special ones from our life so easily. Just like any normal individual, our film stars too have two names. Allu Arjun comes first to the mind of anyone when discussed about this particular topic because his pet name and real name are equally popular.
Sources close to the Allu family reveal, Bunny was the first name of the actor and everyone used to call him with the same. It was only when the plans were made to join him in school, Allu Aravind realized he needs a proper name and named him as Arjun.
Even Today, family and close circles address him as Bunny. This name became popular among fans with the flick 'Bunny' which was directed by VV Vinayak.
Similarly, many of our stars including Mahesh (Nani) and Anushka (Sweety) have two names.