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The Nineties saw Warhammer Fantasy Roleplay as the generic RPG in Poland, as opposed to D&D. It is not so nowadays, though, with the appearance of new editions of D&D and a new generation of gamers. That is, gaming folk still will recognise it, but it's not as dominant as it was.
WFR is still considered the generic RPG, some folks even go as far as marking D&Dnot an RPG.
Blood Bowl is a "Specialist Game" in most countries, with miniatures available but not usually in stores and not pushed as much as the trinity of Fantasy Battle, 40k and The Lord Of The Rings, but in Germany it is considered one of the core games and tournaments are still held there.
Lizardmen in WarHammer are considerably more popular in America than in Britain.
Thanks to having been for quite a long time among the few foreign RPGs translated and published in great numbers, Call of Cthulhu is quite well-known in Italy together with the aforementioned Warhammer Fantasy Roleplay. As with the Polish example above, this is mostly true with older gamers nowadays.
France also has had a long love affair with Call of Cthulhu, in this case despite the fact that lots of foreign RPGs have been translated into French since the 80's at least. It seems to still attract new gamers there as well, as recently, a publisher there released over a dozen superlatively translated, beautifully refurbished (if expensive) hardcover volumes of the rulebook and many of the most iconic adventure compilations and setting books, including a 30th-anniversary edition of the main rulebook as well as Delta Green and its rare-as-hell-in-English expansion, Countdown!!!
Vampire: The Masquerade also had, and largely still has, an enormous popularity in Italy, with several running LARPs and a widespread rejection of the New World of Darkness system in favor of the old game. Since Vampire was the only old WoD game to be translated, this leaves its sister games (Mage, Werewolf et cetera) pretty much unknown.
Privateer Press's Monsterpocalypse sold out world-wide within a week of its release, but nowhere did it sell faster than in Japan. Given that it's the country that madeGodzilla, Mazinger Z, and Ultraman, it's hardly surprising.
Warhammer 40,000, while still decently popular in its homeland of Britain, really took off in the United States, completely displacing Games Workshop's previous works in much of the American tabletop wargame market and providing fuel for large numbers of books and a number of computer games, most with American authors and produced by American companies, respectively.
Shadowrun is disproportionally popular in Germany. The largest Fan Wiki of it online is entirely in German and Germany is one of the best-supported and best-known parts of the Sixth World after the UCAS, thanks in large parts to officially licensed and sanctioned guidebooks that were made in Germany by Ascended Fans. During the kickstarter for Shadowrun Returns the overwhelming fan support led to the creation of a second campaign, the location of which would be determined by fan vote. Berlin won handily, giving rise to the Dragonfall expansion.
Rocky, one of the Emerald City Sentinals in the Emerald City setting of Freedom City, is a Former Child Star who spent most of his career after his show ended touring Japan, becoming moderately popular there as a result. In fact, his character sheet has "Benefit: Status (Big In Japan)" as an actual character trait.
Erin Tarn, the narrator in Rifts, set in an After the End/Science Fantasy future Earth, is this trope literally. While the Coalition States in her native North America consider her to be Public Enemy Number One due to her writings criticizing their evil, across the Atlantic in the New German Republic she is a cultural icon positively worshiped by the public, with television shows and films depicting her (real and fictional) adventures. Since her actual appearance and age (about 70) are not common knowledge, she is generally portrayed as a gorgeous young woman based on photos taken during her youth which have managed to circulate. She was comically shocked when she secretly visited the NGR and discovered both her enormous fame and the Ms. Fanservice CGI depictions of her.