A nice list of phobias here
and an article on how phobias are named from http://phobialist.com
The word phobia is Greek, therefore any word that is connected to it should be Greek. To coin a new phobia name, it is proper to follow this rule. The rule has been broken many times in the past especially within the medical profession which is steeped in Latin and often, when forming a name for a phobia, they have dipped into what they know and have used a Latin suppletion affixed to the Greek stem to form their names.