World's most famous bengali ?

I can always set off a huge argument at Bengali gatherings when I bring up the topic of who is the "World's Most Famous Bengali ?"

Tagore won a Nobel prize, as did Amartya Sen, but those aren't exaftly household names. Lara Dutta was Miss Universe and dated Derek Jeter, but that's still pretty obscure. My dad told me the CNN's Dr. Sanjay Gupta was Bengali, if that is the case, I think we have a contender for WMFB.