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I'm not sure what gender you are (no offense), so I'll give suggestions for both male and female. If you're female, then it's probably some form of "Christina," "Kristen," or "Kirsten." If you're male, then it's probably one of these, which I got when I looked up your name on the database:
COSTANTINO   m   Italian
COSTANZO   m   Italian
COSTIN   m   Romanian
CYSTENIAN   m   Welsh
KISTNA   m   Indian
KOSTANDIN   m   Albanian
KOSTYANTYN   m   Ukrainian
Or, I should think, the name "Carsten." Hope I could help.