In most countries it will be probably DnD. But in mine (Poland) for many years Warhammer Fantasy was THE RPG. Nowadays it is more equal. Other popular games are Call of Cthulhu and World of Darkness line. I see that recently Shadows of the Demon Lord gains popularity. There is also quite alive indie scene. We have some bigger, commercial Polish RPGs (like Monastyr, Neuroshima, Wolsung), but nowadays they are rather not played.
Swede. Can only really relay what’s on the shelves. And that is mostly DnD, Pathfinder, Call of Cthulhu and various stuff from Fria Ligan (free league). Fria Ligan has Drakar och Demoner (Dragonbane), vaesen, Mutant etc. Not surprising that last one as it is a Swedish publisher releasing plenty of Swedish material.
Thanks. Vaesen is translated and published in Poland, but haven’t played it yet.