[quote=@Vilageidiotx]
<Snipped quote by Mihndar>

Use the terms "Hetman" and "Hetmanate" with the Ukraine. It fits their identity more comfortably and makes it feel more Ukrainian. Practically speaking it doesn't necessarily change the function of your government in anyway. 
[/quote]

"Hetman" has no historical or linguistic basis as a demonym or the name of a country, it's only titled that in historical terms because the general/military leader of that state was called the Hetman. It certainly holds no basis in a monarchy. If we're going to be entirely correct on that, it should be called the Kingdom of Zaporizhia.

And Zaporizhia, further, is only a region of southern Ukraine. It's a bit absurd to use a short-lived comparatively small Cossack state as the entire basis for a new Ukrainian kingdom.

To tell you the truth, I wanted to call it Galicia-Volhynia, as that has a much stronger historical basis even if it is further removed in time. I'd be happy to go with that if you think it's preferable.