If you are a Tamilian, show evidence and explain that your fathers First name becomes your Last Name. and Similar is for your spouse.
In case you have submitted a Affidavite for your birth, your father would have said, I xxxx son of yyyy born on dt ddddd and so on. xxxx for you and your spouse may match but yyyy and ddddd will not match.
These kinds of RFE's are possible since in India, we do not have a standard convention to name our kids.