Is bob a name of a pharaoh?
No, there were no pharaohs named Bob.
The name Joseph is Hebrew. The Pharaoh did not give Joseph a Hebrew name, he gave him an Egyptian name, which was Zaphnathpaaneah. Genesis 41:45 And Pharaoh called Joseph's name Zaphnathpaaneah; and he gave him to wife Asenath the daughter of Potipherah priest of On. And Joseph went out over all the land of Egypt.