rainbirdEtymologyFrom the Old French personal name Rainbert, which is composed of the Proto-Germanic elements *raginą (“decision, advice, counsel”) and *berhtaz (“bright, shining”).rainbird means A surname from Old French. Lexicurio rates it Sui generis — a strength score of 91 out of 100.nameA surname from Old French.nounAny of the coucal species Centropus supercilliosus, Centropus cupreicadus, Centropus senegalensis.A grey warbler (Gerygone igata).