No they didn't change their name. They are still called the Chicago Bulls.
The Chicago Lions
Up until the 1970s, the city of Chicago had what was called "the stockyards". These were slaughter houses, located on the south side of town, where cattle were brought in by railroad, slaughtered, and send out by railroad to be sold as beef products. With this history, it's understandable why the city's basketball team would choose to name their team players after the male cattle, bulls.
Chicago Bulls
Benny the Bull
The Bulls is the nickname of the Chicago Bulls team.
Chicago Bulls
The Chicago Bulls.
Pat Riley founded the Chicago Bulls.
Chicago bulls : basketball::
Chicago Bulls was created in 1966.
His name is still Scott Williams