Section 9(1)(a) in The Government Securities Act, 2006
(a)where a Government security other than in the form of promissory note or bearer bond is held by a person in his name or jointly with any other name or names, as the case may be, the sole holder or all the joint holders of the Government security together may nominate one or more persons in such form and in such manner as may be prescribed, who in the event of the death of the sole holder or the death of all the joint holders, as the case may be, would become entitled to the Government security and to payment thereon to the exclusion of all other persons, unless the nomination is varied or cancelled in the prescribed manner;