dhavernasaugust's list "Middle name list #1" of 3 great name ideas: Rain - Wolf!

Middle name list #1

middle names list, somewhat random, some I like, mostly short, nature, word, virtue, place, animal, colour

Among a small shower of rain-related names, this pure version can have a cool, refreshing image. 
 Richard Pryor named his now-grown daughter Rain, and Rain is also one of the nature-named Phoenix family siblings. More recently, 24 actress Marisol Nichols named her daughter Rain India.
 Rain also makes a nice nature middle name--Brooke Burke called her daughter Heaven Rain.
 If you want to embellish this simply spelling (and alter the meaning), you might also consider Raine, Raina, Rainn, Rayne, Reine or Reign, the middle name of Willow Smith. Or you could take the Holly Madison route all the way to Rainbow.

Rain

Strong and outdoorsy, yet pretty and queenly, Rhiannon was a once obscure Welsh name, brought into the mainstream in 1976, following Fleetwood Mac's flash hit song of the same title. It stormed into the US charts, climbing straight to #593 — and to give a better sense of just how influential the song was on the name, Rhiannon had only started appearing in the US stats in 1974, when it was given to 5 girls. By 1976, it was used 50 times more often: chosen for 272 babies.
 
Possibly derived from the Celtic name Rīgantonā, Rhiannon could mean "great queen" or "divine queen". In Welsh mythology, she is a strong, forthright leader, possessed of magic, intelligence, beauty, political strategy, and generosity. She faces trials and challenges after choosing her own consort, including an uncatchable horse, being accused of infanticide, and vengeance from a friend of her spurned lover. 
 
The Welsh Rhiannon may be related to earlier Celtic goddesses, potentially Epona, a goddess of horses. Additionally, in she is considered a moon goddess in Celtic mythology, associated with rebirth, poetry, and beauty, and the owner of singing birds, who supposed wake spirits or grant sleep. 
 
Popular in the UK and Australia in the 90s and 2000s, Rhiannon is currently more quietly used, making it a distinctive but familiar choice, similar in feel or style to Rhys, Arwen, and Ffion. Director Robert Rodriguez bestowed this sweet name on his first daughter while Jenna Dewan also hose it for her baby girl.
 
The Arabic Rihanna looks similar but is unrelated, deriving from Rayhana to mean "basil".

Rhiannon

Wolf is a name with a split personality. It can be seen as one of the fierce animal names, like Fox and Bear and Puma, with a touch of the werewolf, or it can be viewed as a quieter, Wolf Blitzer kind of name, fairly common in German (where is pronounced Vulf) and Jewish families, sometimes as a short form of Wolfgang, or even Wolfram or Wolfhart.

 CNN newscaster Blitzer inherited the name from his grandfather. Other Wolfs of note include British screenwriter Wolf Mankowitz, who was instrumental in the early James Bond films, painter Wolf Kahn, and the hero of Jack London's 1904 novel The Sea-Wolf, Wolf Larsen.

 
Despite all it has going for it, Wolf is relatively rare and has never been given to more than 80 babies in a single year. But now that Kylie Jenner and Travis Scott chose it for their infant son, Wolf is primed to climb the charts.

 Spelling variations Wolfe or Woolf push it into surname territory, while nickname Wolfie definitely domesticates it.