rainbird · noun1
From rain + bird, from the sound of their call, a beautiful liquid gurgle rising and falling like water pouring from a bottle.
Rainbird · proper noun2
From the Old French personal name Rainbert, which is composed of the Proto-Germanic elements *raginą (“decision, advice, counsel”) and *berhtaz (“bright, shining”).
Etymology from Wiktionary, CC BY-SA 4.0.