How do you write the name Mark in greek?

There isn't a single perfect equivalent for the name "Mark" in Greek. The best translation depends on the nuance you want to convey. Here are a few options:

* Μάρκος (Markos): This is the most common and direct transliteration of the name "Mark" into Greek. It's widely understood and accepted.

* Μαρκος (Markos): This is a slightly less formal spelling, but still perfectly acceptable.

Therefore, Μάρκος or Μαρκος are the best choices.