Your question isn't 100% clear but you may be trying to do something Geokit isn't designed for.
Geokit basically does one thing: it takes an IP address, or a physical address, and gives you the lat/long. When you install it as a Rails plugin, you can geocode your models (usually with a street address) and it adds some useful stuff to your model classes. These extra things let you compute distances between your model objects.
AFAIK, you can't get a list of countries from Geokit. On my projects I've either used one of the free online lists, exported a list from another application, or subscribed to a service.