well its hard to say since not all the people knows this guys that you mention ask the children about on the secondary level most of them can answer it but others can't..

i agree with Jura

Surely ,everyone in the world knows him, ie US President Barack Obama.

For me it's Elvis Presley.

president Obama of course. but these are the most famous person to me: Jesus Christ Ernesto Che Guevarra John Lennon Bob Marley Marilyn Monroe Albert Einstein Michael Jordan Mahatma Gandhi .... and James Dean (most of them are printed on my shirts...)