Initially, he believed that he had been born on Earth, Goku later finds out that he belongs to an extraterrestrial warrior race which is called the Saiyans. That was the reason for his superhuman abilities and strength. His birth name is (カカロット Kakarotto) Kakarot.

Goku’s birthday is on April 16, age 736 in planet Vegeta. We are going to use this age because this is the date that has given as Goku’s birthday in the Manga. In the anime his birth year is age 737. Three years later , that means in age 739, before the destruction of planet Vegeta he was sent to earth.