There is a GitHub project called Xcode Project Renamer
:
It should be executed from inside root of Xcode project directory and called with two string parameters: $OLD_PROJECT_NAME & $NEW_PROJECT_NAME
Script goes through all the files and directories recursively, including Xcode project or workspace file and replaces all occurrences of $OLD_PROJECT_NAME string with $NEW_PROJECT_NAME string (both in each file's name and content).