Arle's vivid wings created rainbows in her wake. Those who witnessed her display would know the land had been blessed, for her presence was a sign that no clouds would appear for several days hence.
Arle is probably a variant or a short form of English feminine name Arlene. Arlene is a feminine form of Arlen, from Gaelic origin, meaning "pledge, promise, oath". Or possibly a coinage based on German, Polish, and English Marlene (German origin, blend of the names Latin Maria "star of the sea" and Greek Magdalene "from Magdala") or French Charlene (Old German origin, "free man").