Lukey, Luke "Skywalker", and/or Lukester!!! But, I call him dude sometimes.
Luke or Lue
skywalker
Lex or Governor
lucasade
Flare Flash Monk but it doesnt really matter
has been called obi by some but is usually refered to as general kenobi
It's not a "good nickname", but it's sort of cute. I hope Shelby is a child and not an adult, because it's really a silly name.
Luke Walton
LUKE R ROCK LOLOLOLOLOLOLOloLoLolOlOlOLoLoLoLoLoLOl
h, han, hans, hanny, ham, hammy, hchy?
If you like 'Nan' as a nickname, then yes, it is a good nickname.
You could try Whirley or Swirly it has nothing to do with softball but if she's weird it will really work for her.