Nilesh (sometimes also spelled as Neelesh) is a Hindi name based on one of two deities, Vishnu or Shiva, in Hinduism, depending on which of its two Hindi pronunciations are used. 'Nilesh' means 'the Blue God', and is one of the alternate names for Vishnu, "The Preserver."
Riya is a Hindu name (रिया) and means “singer” in Sanskrit. Because the name is Hindu in origin it is rarely used among English-speakers in the Western World. It is common among Indian immigrants to the West but it has yet to be adopted by the general population.