According to Facebook, your name cannot include symbols, numbers, unusual capitalization, repeating characters, punctuation, characters from multiple languages, titles of any kind, words or phrases instead of a name, or offensive or suggestive words of any kind. You cannot try to impersonate anything or anyone via your new name, and if you have changed your name in the past 60 days, you might not be able to change it again. If you have a business or organization, create a Facebook page for that instead of using a profile.