This map is worth a few minutes of your attention. As was immediately pointed out on the related Reddit thread, the top minority language in Belarus is Belarusian (or “Belarussian,” as the map has it), and in Ireland it’s Irish. Pleasingly, in Finland it’s Swedish and in Sweden it’s Finnish. In Germany it’s Polish and in Austria Turkish; in Czechia (I’m tired of writing “Czech Republic”) it’s Slovak and in Slovakia Hungarian. And in Portugal it’s Mirandese, which I’m pretty sure I’ve never heard of (at least I’ve never mentioned it on LH, which is my first-order approximation of my mental history).