To change your name on your Aadhaar card after marriage, visit the UIDAI website or an Aadhaar Enrollment Center. Submit a marriage certificate as proof of your new name along with your existing Aadhaar card. You can update online if linked to your mobile number, or offline by filling out the form at the center. A nominal fee is charged. Once processed, your updated Aadhaar card will be sent to your registered address.