Sorry I couldn't find anything on the 'net to back up my suspicion that your name may be some kind of pet form of "Kristiana" (with the "tia" pronounced "sha").
I was only able to find references to "Krishan" as being an boy's name of India, meaning either "pearl" or "ray of light". Here's one Indian baby name website that lists the name:
http://www.jnjindia.com/baby/babynames/kboy.htm
-- Nanaea