The Centre had on January 1 last year approved renaming of Allahabad as Prayagraj.
The Supreme Court on Monday sought response of the Uttar Pradesh government on a PIL filed by Allahabad Heritage Society challenging renaming of Allahabad to Prayagraj.
A bench comprising Chief Justice SA Bobde and justices BR Gavai and Surya Kant issued notice to the state.
The Centre had on January 1 last year approved renaming of Allahabad as Prayagraj.