It is only possible to change the name of a Page with less than 100 likes. If an error was made in your Page name when it was created, you have the option to edit it.
To edit your Page name:
Go to your Page and click Edit Page in the upper-right corner
Select Basic Information from the menu at left
Change the text in the Name field and save your edits
To change the name of a Page with 100 or more likes, you will need to delete your Page and recreate it. The Facebook team isn't able to change Page names for you.
Please provide feedback to help us better understand your Page's needs.
Related topic: Revising a Page username