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Im talking about a list of forbidden words that CANNOT be used as a part of a user name, or First Name / Last Name.
For example, it wouldn't be good to allow someone to use the word "Admin" or "Administrator" in any of their name fields, or some obscene word. Being able to use the word "Admin" for example, could allow them to trick other users into thinking they are affiliated with the company.
jomsocial is running under joomla. for registration (step 1) we follow joomla users component for validation. if you want make some restriction like that. you must find joomla extension for that.