When I was looking for info on Saiyuki and learned it was based on the Chinese novel Journey to the West, I was reminded of some things:
The Japanese name of Sun Wukong, the Monkey King, is Son Goku.
Sun Wukong (孫悟空) is known/pronounced as Suen Ng-hung in Cantonese, Tôn Ngộ Không in Vietnamese, Sun Ngokong in Thai, Sun Gokong or Sun Go Kong in Malay and Indonesian, Son Ogong in Korean, and Son Gokū in Japanese.
Some question here refer to Goku from Dragonball as Son Goku.
A number of images of Sun Wukong show him on a cloud with a staff, similar how Goku in the original Dragon Ball Series is shown with Nimbus and his staff.
So, I am wondering if Goku in Dragon Ball is based on Sun Wukong from Journey to the West?