The answer you want is Cardiff City (not very English though).
They didn't, it's the clubs nickname, much like other clubs like Cardiff are called 'The Bluebirds' etc.
There is not a football team in England with the nickname of the spirits. However, there is a team called the Spirites, given to the team in Chesterfield.
The nickname of Michigan is Supercalifragilisticexpialidoches!
The nickname of the football team of Louisville is "Cardinals". This is the name that is used for all the athletic teams for the University of Louisville. The nickname is sometimes shortened to "Cards".
It was actually a nickname for the Spanish football team, Cádiz CF.
They are called the 'Selecao'.