For Example:

Did you know that when Missouri first became a state the area now known as Johnson County, Missouri was contained in a large county named for state legislator James Lillard?  Lillard County reached from the Missouri River to the Osage River and Lexington was founded as the county seat in 1822.  The name of the large county was changed to Lafayette after the tour of the French general in 1825.  By 1834, the new county of Johnson was established with its original county seat in Columbus.