He was eighth child in his family, so he was named Krishnamurthy which also happened to be his uncle’s name and there was a lot of confusion in the house, so they changed his name to Madan. his brother’s name is Padmanabhan a.k.a. Babu. Both started a music group called ‘Madan and Babu’. In time, the Babu became Bob and that’s how director Balachander introduced him in his first film.