It has a different name that holds to the theme and the alliteration in every language. The actual reason it's named RRR is because it's the combined talents of Actors N.T. Rama Rao Jr, Ram Charan and director SS Rajamouli. Apparently (I'm American so this is like...7th hand knowledge), that's roughly the equivalent of if it was 1996 and Tom Cruise and Will Smith made a movie with Steven Spielberg.