What does Riya mean?
Commonly given as Sanskrit-derived riya (रिया), 'singer' or 'graceful'. It is not well attested in classical Sanskrit literature, so this meaning is popular rather than firmly documented.
What does Aadhya mean?
From Sanskrit adya (आद्या), feminine 'first, primordial, the beginning'; used as an epithet of the primordial Goddess (Adi Shakti / Durga).