Why Obi Wan Chose the Name BEN Kenobi on Tatooine

Why Obi Wan Chose the Name BEN Kenobi on Tatooine

When Order 66 was executed, Obi Wan chose to go into exile on Tatooine, there he changed his name from Obi Wan to Ben Kenobi, why was this the case and where did he come up with this new name….