short form of the Hungarian name Krisztina.
A Kriszti is normally a cute, kind-hearted girl with a love for dogs and animals, music (dancing, jazz...) and, sometimes, science stuff, like maths. They can seem innocent, but are responsible and trustworthy. If one knows a Kriszti, they'll probably be aware of their emotional bribery skills.
-Is that girl called Kriszti?
-Yep. It's a very rare name.
-I think that makes it special