No they didn't change their name. They are still called the Chicago Bulls.
Remember The name
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.
The name comes from the great stockyards in that were once located in Chicago.
He lived in Chicago before becoming president.
The Chicago Stadium.
Chicago Bulls
Benny the Bull
The Bulls is the nickname of the Chicago Bulls team.
The Chicago Bulls were part of the Western Conference until 1980. The league shifted Chicago to the east after Dallas Mavericks was added in expansion.
Chicago Bulls
Chicago Bulls