Kṛṣṇa and Arjuna are addressed by many names across the eighteen books, and the choice is rarely decoration — each name carries a meaning, and the song tends to reach for a particular one at a particular kind of moment. Every name and citation below is verified against the verses themselves, in Sanskrit; nothing here is assumed.
Counts and citations are drawn only from the eighteen books as they stand here — a name absent above may simply be one the tradition uses that this text does not, in the verses currently open.