Christi (Kristy if you want different spelling), Crissy, Chrissy, Tina, or if you meant Christiana, you can use Ana, one of my friends uses that only she says is like "Anna".
Christina agullara is a good singer darling
Christina Giuseppe goes by Christy, Chris, and Bella Christina.
Christina Sewell goes by Chrissy.
Christina Sinclair goes by Tina.
Christina Kane goes by CK.
Christina Jisborg goes by Cicci.
Christina Killelea goes by Christy.
Christina Klug goes by Chrissi.
Christina Kelley goes by Chris.
Christina Holzer goes by Xina.
Christina Horgan goes by Chriss.
Christina Dodson goes by Chrissy.