package—a package designator.
new-name—a package designator.
new-nicknames—a list of string designators. The default is the empty list.
package-object—the renamed package object.
Replaces the name and nicknames of package. The old name and all of the old nicknames of package are eliminated and are replaced by new-name and new-nicknames.
The consequences are undefined if new-name or any new-nickname conflicts with any existing package names.
(make-package 'temporary :nicknames '("TEMP")) → #<PACKAGE "TEMPORARY">
(rename-package 'temp 'ephemeral) → #<PACKAGE "EPHEMERAL">
(package-nicknames (find-package 'ephemeral)) → ()
(find-package 'temporary) → NIL
(rename-package 'ephemeral 'temporary '(temp fleeting))
→ #<PACKAGE "TEMPORARY">
(package-nicknames (find-package 'temp)) → ("TEMP" "FLEETING")