Each package has a name (a string) and perhaps some nicknames (also strings). These are assigned when the package is created and can be changed later.
There is a single namespace for packages. The function find-package translates a package name or nickname into the associated package. The function package-name returns the name of a package. The function package-nicknames returns a list of all nicknames for a package. rename-package removes a package’s current name and nicknames and replaces them with new ones specified by the caller.