One afternoon I got a "friend" request from someone on Facebook. I did not recognize the name, for a variety of reasons, one of which was the name was written in Chinese script. I saw that we had one friend in common, another missionary friend of mine from 30 years ago when I lived in Japan. Still, I really did not recognize the name. I couldn't pronounce the name. I no longer read Japanese.
So, I sent this person a message, asking them, "Are you one of my former students from Japan?"