The subject of this article has not yet been localised outside of Japan by Konami. Please remember that these romanisations are non-canon.
The Coutan Republic was the nation of the Coutan people that existed before the attacks of the Terrus Firma. As Coutan was located far from the Holy Empire of Ionia and the effects of its Barrier, it was destroyed by the Terrus Firma many centuries ago.
Since then, the remaining Coutan people have spread across the Empire.