Well,
Firstly you have a wonderful name so you could keep it the way it is but if you're looking for something fun go for something short that sounds good to you, for example,Kassie or Dee sounds good, or Kass.
Spell it anyway you like
My nickname is Rosie as the first three letters match my name but my closest friends call me Roshy.
Go for something that makes you feel comfortable :D
cass Cassie ,
Cassie could be a nickname for the names Cassandra, Cassidy, or Casandra.
Cassie ,cassie couture chaotic Cassie
A good nickname for Zekrom would be "Black Dragon".
CC, C-Money and Sissy
Chris or CJ could be good nicknames for Christian.
Tali would be a cute and short nickname for Talia.
In Hawaiian, the name Cassie would be spelled as Kasi.
yes it is my dad's name is Cassie noob.
Dave is itself a nickname for David. Another nickname for Dave would be Davey. Alliterative forms that refer to some aspect of the particular Dave would be possible, such as "dancing Dave."
Magayla
Al would be a good nickname for Alex. Alex is actually a nickname for Alexander.if its a boy i would go with the above, but if its a gril one is: LexiAlso a good 1 for Alex is Aleksy