For a steed so faithful and so majestic as your Cannondale, I'd skip the "naming after" to avoid giving her "performance anxiety". Instead I'd name her for a fine breed of famous whites.
Name her Lipizzaner... you can use "Zany" as an affectionate call name.
In doing a search for other white horses, lookie what I found....isn't he a beaut? My heart does a flutter-thing for these Arabians.... but I've always admired the Lippizaners, as well. I saw them in Fresno when I was a kid. Hmmm...maybe I can find an individual Lippizaner sire/dam as a namesake??? Good idea, Spazz, I like it! Zany's a good name, and somewhat describes my personality, as well. I'll let ya know what name I finally choose. I can see this may be a hard decision.
Sulis -- I remember now that I heard that about the Flicka name. Makes it fit even better!
"Only two things are infinite, the universe and human stupidity, and I'm not sure about the former." --Albert Einstein