In J. R. R. Tolkien's high fantasy legendarium, Arien is a beautiful maiden who guides the vessel of the Sun. In the Days of the Trees in Valinor, Arien had been the one to tend the tree of Laurelin. It is said that she is mightier than Tilion, the Maia chosen to guide the Moon, because she is a spirit of fire, and able to withstand the heats of Laurelin.

Aire-sur-la-Lys is a commune in the Pas-de-Calais department in northern France.