
1) Celtic boy name 2) Irish-language boy name 3) Mythological cycle
Found on
https://www.crosswordclues.com/clue/cian

In Irish mythology, Cían (kʲiːən, `long, enduring, far, distant`), also known as Scal Balb, son of Dian Cecht of the Tuatha Dé Danann, is best known as the father of Lug. In most versions, Lug`s mother is the Fomorian princess Ethniu, but in some versions Cian is also known as Ethlend, hence Lug is known as Lug mac Ethlend In the saga Cath......
Found on
http://en.wikipedia.org/wiki/Cian
[name] Cían is a Gaelic given name meaning `ancient`. ==People== ==History and mythology== ...
Found on
http://en.wikipedia.org/wiki/Cian_(name)

In Celtic mythology, Cian is the god of medicine. He mated with Ethlin who gave birth to Lug.
Found on
http://www.probertencyclopaedia.com/browse/D3.HTM
No exact match found.