Doubts about affidavit.

There is a tradition (at some places in India) that married women should write her husband's surname in stead of her previous surname. But all her documents done earlier (like PAN Card etc) carry previous surname. Now should a married woman make an affidavit stating that two names with her pre- and post-marrige surname denote the identical person? If so, then should it be processed by a notary or first class judicial magistrate or a district magistrate? I heard that such affidavit if done by a notary has limited validity period, something like six months or so whereas the same done under a first class judicial magistrate is valid always. Please clarify my doubt. Thanks.