In junior high, we had a frequent substitute teacher whose last name was Cumm. We couldn't believe it when we found out his first name was Richard.
Also, in high school, there was a math teacher whose name was Alec Dick. On our schedules, under our classes it would say the teacher's first initial and then his last name, so a lot of us had math class with A Dick. Of course, being the type of kids we were, we had to circulate the joke about his wife's name being Ivanna (it was a total buzzkill when we learned what her name actually was).