
Bhavishya Purana states that God, the Creator, gave the name and duties of Chitragupta as follows:
Because you have sprung from my body, therefore, you shall be called Kayastha and shall be famous in the world by the name of Chitragupta. Oh my son, let your residence be always in the region of the God of justice for the purpose of determining the merits and demerits of men.