Acyutānanda: It already has our name. If the Bhagavad-gītā is in the Mahābhārata—that's itihāsa—how did it get the name Upaniṣad, Gītopaniṣad?
Prabhupāda: Because it is spoken by Kṛṣṇa. Itihāsa also Vedic literature. Pañcama-veda, Mahābhārata, for understanding of the common man. Strī-śūdra-dvija-bandhūnāṁ trayi na śruti-gocarāḥ (SB 1.4.25). Woman, śūdra, and dvija-bandhu, they cannot understand directly the Vedas.