In Punjab, changing your surname after marriage involves a legal procedure. First, prepare an affidavit stating your intention to adopt your spouse’s surname. Next, publish a notice in two local newspapers (one in English and one in the regional language) announcing the change. Optionally, you can apply for a Gazette notification for formal recognition. After the legal process is completed, update your surname on documents like your copyright, bank records, Aadhaar card, and other official IDs.