IntlRegions

const regions = ['pl']

const displayNames = new Intl.DisplayNames('pl', {type: 'region'})

export default function App() {
  return (
    <main>
      <select>
        {regions.map((code) => (
        <option key={code} value={code}>{displayNames.of(code)}</option>
        ))}
      </select>
    </main>
  )
}