There might be a 7-up in the mix. However, that's the only possible named one I recognize at this time.
Most Rainbos are not named anything other than Rainbo.
Names are usually reserved for the NLR's. (NLR = National Line Rainbo -- so they're still Rainbos, eh? They're an older style though, which came from the late 20's and early 30's. And often appear in boxes which say National Line on them. And that's where you'll have a better chance of having named ones, such as Zebra, Christmas Tree, John Deere, etc.)