If you need to expand an initial on your child's birth certificate in Tamil Nadu, such as changing 'Lokesh. B' to 'Lokesh Balaraman', it's important to know that directly altering the birth certificate itself for this purpose isn't possible. While you can follow standard name change procedures, these typically won't modify the original birth certificate. For applications like passports, you can often provide the full name, including the surname, which may then be reflected across other documents.