<s>[INST] When did the change of name "Pondicherry" to "Puducherry" take effect under the Pondicherry (Alteration of Name) Act, 2006? [/INST] The change of name "Pondicherry" to "Puducherry" took effect under the Pondicherry (Alteration of Name) Act, 2006 on October 1, 2006. </s>