The reasons for refusal to correct the name in the birth register by the MCD is given below:

Under Section 15 of the Registration of Births and Deaths (RBD) Act, 1969, the Registrar is empowered to make corrections or cancellations only if an entry is proven to be "erroneous in form or substance, or has been fraudulently or improperly made".

MCD considers the birth register to be an authentic historical record of the event as it took place at birth. Since you  named your child voluntarily at the time of registration and changed it three months later, MCD views this as a subsequent personal name change rather than a clerical error made at birth. Standard MCD administrative protocol dictates appending an alias (e.g., [Old Name] alias [New Name]) rather than purging the original record entirely.

You may please note that the passport officials generally don't entertain name discrepancies, but under Ministry of External Affairs (MEA) Passport Rules, a Gazette Notification is the ultimate proof of a legal name change in India. MCD does not necessarily need to re-issue the birth certificate with only the new name if you present the full documentary evidences in this regard.

If front-desk executive staff reject the application, book a Public Inquiry / RPO Appointment at the Regional Passport Office (Herald House, ITO or RPO Delhi). Senior officers are well aware that a Gazette notification legally overrides the old name on the birth certificate.

If you still insist on the birth certificate to be issued with the new name alone by the MCD then you may have to file a suit for declaration and mandatory injunction against MCD to declare the new name as legally valid and to direct the authorities to reissue a new birth certificate incorporating the new name.

Once the Civil Court issues a decree, MCD is legally bound to comply and issue the clean certificate.

You can file an appeal if there is a remedy before MCD or go for writ petition in high court

From the facts stated, you have already completed all the formalities generally required for a name change—namely, execution of an affidavit, publication in newspapers, publication in the Official Gazette, and updating the Aadhaar. If the MCD is still refusing to substitute the old name with the new name in the Birth Certificate, the refusal must be supported by a specific statutory provision or written order. A mere oral refusal is not sustainable.
You should first insist on a written speaking order from the Registrar of Births and Deaths stating the precise reason and the legal provision under which the request has been rejected. If no written order is provided, submit a written representation and seek disposal in writing.
If the Registrar continues to refuse the correction despite compliance with the applicable rules, you have a strong case to approach the Delhi High Court under Article 226 of the Constitution by filing a Writ Petition (Mandamus) seeking directions to the Registrar, MCD, to issue a fresh Birth Certificate reflecting only the new name. The High Court can also examine whether the Registrar's insistence on merely adding an alias is arbitrary and contrary to law.
Since your son is still a minor and the request was made shortly after birth, and there is no allegation of fraud or impersonation, the Court may direct the authorities to consider the request in accordance with law. The fact that the Passport Authority is unable to proceed because of the discrepancy between the Birth Certificate and all other identity documents further strengthens your case.
Before approaching the High Court, preserve copies of:
The original and revised Birth Certificate records.
Affidavit for change of name.
Newspaper publications.
Gazette Notification.
Aadhaar showing the new name.
All applications submitted to the MCD.
Any acknowledgements, rejection slips or correspondence from the Registrar.
If the MCD has not passed a formal written order despite multiple applications, the High Court can also direct it to decide your application within a specified time and, if the refusal is found to be unjustified, direct issuance of a corrected Birth Certificate. This is generally the most effective and expeditious remedy in such circumstances.

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Dear Sir/Madam,

MCD may refuse complete substitution where the original name was correctly entered, as Section 15 mainly permits correction of an erroneous entry. Gazette publication alone does not automatically require alteration of the birth register.

Submit a formal written application and obtain a reasoned rejection order. Thereafter, file an appeal before the District Registrar under Section 25A; if relief is denied, approach the Delhi High Court for appropriate directions. Keep the affidavit, Gazette, Aadhaar, passport correspondence and both parents’ consent ready.

Advocate Saurabh Agrawal

Dear Client, The stance taken by the MCD local office at Raja Garden is legally floored and stems from a narrow administrative misunderstanding of routine name additions versus statutory name changes under the Registration of Births and Deaths Act red with central guidelines once you have successfully completed a legal name change via a notarized affidavit nationwide newspaper publications and the official gazette notification you hold supreme statutory proof of identity The municipal authorities are bound to recognize this change and refusing to completely update the primary name forcing an unwanted instead violate standard practice and creates lifelong administrative hurdles for your son.

Because local municipal offices often resist substantive changes due to internal software limitations or rigid bureaucratic guidelines bypassing the regular desk officers is usually necessary You should formally submit a comprehensive tract representation address directly to the registrar or zonal health officer of West Zone MCD Raja Garden attaching copies of your affidavit newspaper clippings and the official Gazette notification and his updated Aadhar card Explicitly state in the written representation that a minor’s name change via the central gazette supersedes local database restrictions and request a formal speaking order if they choose to deny it.

If the local office continues to refuse or stalls the process you have strong legal remedies available in Delhi to secure a permanent resolution you can file an online grievance through the MCD portal or Delhi government’s grievance mechanism referencing your previous rejections or approach the High Court of Delhi through the repetition under Article 226 to issue a mandamus directing the MCD to update the birth certificate Alternatively since Passport authorities are already aware of your valid Gazette notification and Aadhar you can request the Passport Office to process the application based on Gazette and Aadhar as primary identity proofs. I hope this answer helps, if you have any further query kindly do not hesitate to contact us. Thankyou

Best of luck