Actually both ways of writing can be used; but since you pointed out the greek writing, i can tell you that "ou" reads as a "u" in Pontus in Ancient Greek, so Pontus is quite correct and jirisys did a good job.

To change the topic, there's another preview that's almost ready... It's being worked on by our member keravnos, who you guys might now as one of the historians from the EB team... Any thoughts of whom the new preview could be? If you guess (or if you are close), you'll get a present