Changing child surname

As per your question about changes in the Aadhar card, let me brief you about the procedure- 

UIDAI stands for Unique Identification Authority of India and is responsible for issuing and maintaining Aadhar cards. You can change the surname of your child online. Here are a few steps to follow: 

• The first step is to open the www.uidai.gov.in website. 
• The second step is to log in using your child’s Aadhaar number. 
• Thirdly, submit a request for a name change. You can change his surname or both of his names in the specified format. 
• You will be required to provide valid documents of the name change as approved by the Government. These self-attested documents should be scanned and then added as supporting documents. 
• The next step is to authorize and verify his name change by inserting the OTP sent to the registered mobile number into the relevant slot. 
• Once the name change is approved after validating and verifying all your documents and proofs, a message will be sent to your registered number.
• The update process takes about 90 days and after the process is complete, you can download your e-Aadhaar through the UIDAI site post verification. You can also visit the nearest Aadhaar enrolment centre to get a soft copy of your updated Aadhar card.

As per your question about changes in the passport- 

To change the surname in the passport, you have to visit the Passport Seva Kendra or the official website and apply for a "Re-issue" of passport. 

Download Form No. II for Miscellaneous Services and fill in the required details. Along with the form, the applicant will have to submit the following documents:

• Original Passport along with a copy of the first two and last two pages that have been self-attested.
• Based on the reason for the change of name, affidavit, or Deed Poll along with original advertisement in two daily newspapers (this is accepted only 30 days after publishing of the said advertisement) needs to be submitted.

The corrected Passport will be sent to the applicant after a few days.

As per your question about changes in the birth certificate, 

In Delhi, the procedure to make changes in the birth certificate is offline. You can send official papers along with the application form via speed post at the address of the Gazette office. 

Hope it helps, 

Regards, 

Srishti