In a system, to increase the security and reliability of the data, it would be interesting to know if the CPF informed to the site corresponds to the given name. I did not find any script on the internet to do this kind of correspondence. As the IRS, it has available in the link link a page to check the name and the situation of the person who owns the CPF from the number of the CPF and the date of birth, I believe that this could be calmer.