Likely a modern spelling related to Rhea, the Greek mythological mother of the gods.
Rhya is a contemporary spelling variant of Rhea, a name with roots deep in Greek mythology. Rhea was a Titaness — daughter of Uranus and Gaia, sister and wife of Cronus — and, crucially, the mother of the Olympian gods: Zeus, Hera, Poseidon, Demeter, Hestia, and Hades. She was called the Mother of the Gods and associated with fertility, generation, and the flow of time.
When Cronus swallowed each of their children to prevent the prophecy of his own overthrow, it was Rhea who outwitted him, hiding the infant Zeus in Crete and handing Cronus a stone wrapped in cloth instead. The name also appears in Roman tradition as Rhea Silvia, the Vestal Virgin who was mother to Romulus and Remus, the legendary founders of Rome — giving the name a second mythological anchor of foundational importance. In linguistic terms, Rhea may derive from a proto-Greek root related to flowing or ease of movement, cognate perhaps with the Greek word rheo, to flow.
The planet Saturn's moon Rhea, discovered in 1672, carries the name into the astronomical canon. The Rhya spelling softens the classical reference and gives the name a more personal, modern identity without entirely severing its mythological threads. It has grown in use alongside similar spellings like Riya (a popular South Asian name meaning singer or gem) and Ria, creating a small constellation of phonetically related names with different cultural origins. Parents drawn to Rhya often want the mythological depth of Rhea with a spelling that feels uniquely their child's own.