The famous name Vikram Pandit is associated with option 2, Citigroup. Vikram Pandit is an Indian-American banker and business executive who served as the CEO of Citigroup from 2007 to 2012.
Cairn Energy, option 1, is a British oil and gas exploration and production company, and Vikram Pandit is not associated with it.
PepsiCo, option 3, is a multinational food and beverage corporation, and Vikram Pandit is not associated with it.
Vodafone, option 4, is a multinational telecommunications company, and Vikram Pandit is not associated with it.
Therefore, the correct answer is option 2, Citigroup. Vikram Pandit`s association with Citigroup as its CEO is well-known in the business and finance world.