I'm sure all you FG's have Japanese friends, colleagues, customers, etc. who you call Tanaka-san for example when speaking English (or another language other than Japanese). And since my job puts me in contact with a lot of customers outside of Japan I've noticed that even people in offices overseas will refer to their Japanese counterpart as Tanaka-san as well so it's not just us Japanicized FG. It seems a lot of Japanese people prefer to be referred to that way regardless of who they're dealing with and what language they're speaking. A lot of them will also call me Samurai_Jerk-san.
Is there any other country/culture you're aware of where this is common?