Give Public Notice in the newspaper that 'Mohamad Parvez ' son of ----and 'Parvez' son of ----both names are of yours and the only one person i.e.therefore wherever 'Parvez' is mentioned and referred the same means and relates to 'Mohamad Parvez' only to you and not to any other person. Thereafter file a suit for declaration to the effect that both the names belong to you and same person and seek correction in the documents on the basis of court decree.