The name Rainey is a girl's name of English origin meaning "queen". Rainey and is often added to lists like Weather Baby Names and discussed in our forums with posts like "Girls Makeover - Two Middles".
From the experts:
Has an old-time country feeling, perhaps due to Ma Rainey, considered the "Mother of the Blues". This is the most popular spelling of the name, given to about 50 girls last year, with half as many called Rainy and a quarter named Rainie, the spelling used by Andie MacDowell for her now-grown daughter.