What does Dhruv mean?
From the Sanskrit ध्रुव (dhruva), 'fixed, firm, immovable, constant'; also the name of the Pole Star and of the boy-devotee Dhruva in the Puranas, who became the unwavering North Star.
What does Pranav mean?
From Sanskrit pranava (प्रणव), the term for the sacred syllable 'Om', regarded as the primordial sound. A spiritually weighted name meaning the mystic syllable itself.