Answer:
Teachers have ordinary last names - I usually either go look in a phone book, or scroll through the credits on whatever DVD is closest to me at the time - both will give you a long list of last names to pick from!
Miss crumplebottom.
There are many good names, including Miss Crumplebottom. But if you are writing a story or playing house or for whatever reason you want to know a good teacher name, perhaps you could use a former or current teacher of yours names'.
Teachers are real people -- a teacher would have a real name. See the link for a name generating website.