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.
Brazilian. D&D is naturally at the top, as I expect in most places (thought WotC has been fumbling and won’t publish translated material any more, so I wonder for how long). I don’t know how popular P2e is, if its at all.
Following that, there’s 3D&T/Tormenta/T20 which is a local fantasy game, and Ordem Paranormal which is a hack/mod/spin-off(I can never get which means which) based off CoC.
There’s also Old Dragon 2/OD2/New Old Dragon which is a national (surprisingly, given the name) OSR fantasy game inspired by AD&D
I actually haven’t played any of these, I’ve been a PbtA guy for a while, although at the moment I’m extremely Lancer pilled