Hey, maybe it factored into the decision to name them, although it's unlikely.
From what I understand, the reasons for picking nicknames are quite random. As another commenter mentioned, people named Sunil or Sanjeev go by Sunny sometimes, although other times it is just picked out of the blue, like with Bollywood actor Sunny Deol, whose real name is Ajay. His brother Vijay uses the screen name Bobby, by the way. Random.
