What does Aarav mean?
From Sanskrit arava (आरव), literally 'a sound, roar, or shout'. Although hugely popular today and widely marketed as meaning 'peaceful' or 'calm', that gloss is a modern reinterpretation not supported by the root; the attested classical sense is 'noise/sound', sometimes softened to 'melody'.
What does Reyansh mean?
A modern coinage usually read as 'ray of light', often analysed as 'ray' plus the Sanskrit amsha (अंश, 'portion/part'), giving a devotional reading 'a part of Vishnu'. The Vishnu link is an interpretation built on amsha rather than a documented classical meaning.