Why hank Williams is called bocephus?

Hank Williams is not actually called Bocephus; that nickname belongs to his son, Hank Williams Jr. The name "Bocephus" was originally given to him by his father as a nod to a character from the television show "The Grand Ole Opry." Hank Jr. adopted the name as part of his own persona in the music industry, and it has since become closely associated with him.