My first collie looked just like that as a pup, his AKC name was Bonnie Prince Andrew, we called him Andy. My tri-color was Kat's Paws Desert Sugar, called Sugar. We've had Desert Sands, called Sandy, a Blue Merle, Blue Boogie Bugle Boy, called Boogie. Look at your own name, your screen names, your hobbies, nicknames, it's not hard to come up with something pretty original.
Just going off your screen name how about Sweet's Pretty Lady? Or Sweet's Scottish Princess. Depending on the dog's bloodline and Sire's and Dam's name too,, what are they?
Mine first though was Lacy. NOT Lassie, that is too common. She is so sweet . . .I don't really care for Collies all that much, but she is just beautiful. I like smaller dogs, only reason why!! Nothing personal!! A collie never bit me or anything!!