Famous is a very subjective term and keeps changing with the time. A person may be most famous today may not be the most famous tomorrow. Also a person may be most famous in one geography but may be most notorious in another. So I am going to answer it in a different way by providing the general list of top 10 famous personality -
1 Jesus of Nazareth (5 B.C. -. A.D. 28)
Google searches: 24.9 million+ per month
2 Abū al-Qāsim Muḥammad ibn ʿAbd Allāh (A.D. 570–632)
Google searches: 13.6 million+ per month
3 Abraham (1812–1637 B.C)
Google searches: 9.1 million+ per month
4 Moses (1300–1180 B.C.)
Google searches: 2.7 million+ per month
5 Siddhartha Gautama (Buddha) (563–483 B.C.)
Google searches: 4 million+ per month
6 Paul the Apostle of Tarsus (5–A.D. 67)
Google searches: 3.35 million+ per month
7 Adolf Hitler (1889–1945)
Google searches: 6.1 million+ per month
8 William Shakespeare (1564–1616)
Google searches: 7.4 million+ per month
9 Leonardo di ser Piero da Vinci (1452–1519)
Google searches: 4 million+ per month
10 Sir Isaac Newton (1642–1727)
Google searches: 1 million+ per month