In Aadhaar, if your surname starts with a lowercase letter, it may not cause any issue with the validity or authenticity of your Aadhaar card. However, it is always advisable to ensure that the information on your Aadhaar card is accurate and up-to-date, as this information may be used for various purposes, including opening a bank account, applying for a loan, or filing taxes.

If you need to update the information on your Aadhaar card, including your surname, you can do so by visiting an Aadhaar enrolment centre or by using the UIDAI’s online self-service portal You will need to provide supporting documents to make any updates to your Aadhaar card information.