What does Nagaraja mean?
From Sanskrit नागराज (nagaraja) 'king of snakes', from naga 'snake/serpent' + raja 'king' (also spelled Nagaraj in Tamil/Kannada/Telugu usage). A well-attested compound; the serpent sense is secure.
What does Devadatta mean?
From Sanskrit deva 'god' + datta 'given' (past participle of da 'to give') — 'god-given' or 'given by the gods'. A 'gift of God' name expressed as an act of giving.