Not really that surprising to me, Kotlin is named after a Russian island, so naturally their non-developer populace will use the term more than the rest of the

Not really that surprising to me, Kotlin is named after a Russian island, so naturally their non-developer populace will use the term more than the rest of the world and the programming language was created by JetBrains, a Russian company, so I'd also assume there's probably some elevated interest for Russians in something successful that's also "home grown".