Changing a child's name on their passport in Haryana involves a legal name change, including an affidavit, gazette notification, and newspaper ad. Parents must gather documents like the birth certificate and proof of the name change. After completing the paperwork, they can apply online or at a Passport Seva Kendra. The process takes 10-15 working days for normal passports and 3-5 days for Tatkal services. Accurate documentation is crucial to avoid delays.