How do you write Christina in greek?

There isn't a direct, single perfect translation of "Christina" into Greek. The best approach depends on the nuance you want to convey:

* Χριστίνα (Christina): This is the most common and widely accepted transliteration. It's easily recognizable and understood by Greek speakers.

* Κριστίνα (Krstina): This is a closer phonetic approximation, but might be considered slightly less common.

Both options are perfectly acceptable, and most Greeks would understand either one. The first, Χριστίνα, is generally preferred.