Another country that comes to mind(or should that be to hand?!)-Japan.
There’s a whole spanking comics industry out there, much of it based on home otk spankings.
The question here is whether that was the case in pre-WWII Japan ie before the American occupation, therefore whether or not spanking was essentially imported from an English-speaking country.
I do know that Japanese pornography dates back as early as C16, but I haven’t studied it, so don’t know if it includes spanking of any sort.