What does Nakul mean?
From Sanskrit nakula (नकुल), literally 'mongoose'. Best known as the fourth Pandava brother, twin of Sahadeva, in the Mahabharata, renowned for his beauty and skill with horses.
What does Nirav mean?
From the Sanskrit निरव (nirava), 'soundless, still', formed from nir- ('without') + rava ('sound, noise') — hence tranquil stillness. A genuine, if less common, classical formation.