The statement is not clear.I ask all the respected members ,to write clearly,when you put a question or need guidance.No matter.
If your child has passed the Matriculation exam. Then give advertisement in two newspapers, mentioning that Ihave changed the name of.........to .....this.NOw all call me by this name [news paper agent know the statement well]. Then by filling a form [change-in-name-form fron P.S.E.B.] ,attested by head ,then sent it to pseb with original certificate.Withen a month the name will be changed.'
If your child is under-primary, then visit the office of''Registrar,birth and death,at distt. level or Municipal committee office. There is a provision to change the name, at any time. But you have to do some labour.