Which ministry approved UP's proposal of renaming Allahabad as Prayagraj?

The Union Home Ministry approved a Uttar Pradesh government proposal to rename Allahabad as Prayagraj. In October 2018, the UP government had proposed the change in name of Allahabad to Prayagraj. The Home Ministry clears the name change proposals after the Ministry of Railways, the Department of Posts and the Survey of India confirm that no city, town or village has similar names.