I read it somewhere and I qoute
"So during the trip to india, Zardari was so impressed with the popularity enjoyed by Manmohan Singh, he decided to change Bilawal "Bhutto" Zardari to Bilawal Singh Zardari. But as soon as they return to Pakistan, Zardari will change his son's name to Bilawal Khan Zardari due to the political popularity now enjoyed by Imran Khan. However, Shareef braderan are rumored to be in negotiation with the president to rename his son to Bilawal Shareef Zardari to form coalition against Imran Khan. Inside sources claim that Mr. 10% might just play it safe and the official name could become Bilawal Bhutto Singh Khan Shareef Zardari. "Chaudhry", "Kiyani" and "Bhai" are also under consideration..."