According to sources, Prime Minister Narendra Modi has several pet names and many of his party members use different names to address him. President Pranab Mukherjee, it has been learnt, calls him Narendro ji while former Bharatiya Janata Party president Kushabhau Thakre called him 'chhota bhai. Atal Bihari Vajpayee always called the present PM as Narendra bhai. It has also been learnt that several BJP leaders called him 'lion' during his campaign run. Most interestingly, a few south Indian MPs address Modi by calling him 'Singham'.