What does Krishna mean?
From Sanskrit krishna (कृष्ण), literally 'black, dark, dark-blue'. It is the name of the eighth avatar of Vishnu, the beloved deity of the Bhagavad Gita and Mahabharata, so the name is first and foremost a divine name.
What does Aarnav mean?
From the Sanskrit अर्णव (arṇava), meaning 'ocean' or 'sea', literally 'the foaming/surging water'. A well-established classical Sanskrit word for a great body of water, commonly spelled Arnav or Aarnav.