What was Nana Patekar's real name and how did he get the nickname 'Nana'?

Veteran actor Nana Patekar's real name was Vishwanath Gajanan Patekar. In an interview with The Lallantop, he revealed that his mother's close friend, whom she considered a sister, affectionately called him 'Nana' during childhood. The nickname stuck, and Patekar later said the name appeared on his passport, Aadhaar card and other official documents, while his school friends called him 'Vishu'.