I need a name for a teacher. Help?

Hello! I'm writing a story and one of the characters is the protagonist's teacher. The teacher is male, and he's really old and nice. Also he's got a moustache. (Not that that's really relevant but I felt the need to add it in). Any name suggestions would be greatly appreciated! Thanks in advance!

andrew (Our Supreme Lord and Overseer) Johnston (Mr. Johnston)

Lol I instantly thought of my teachers name..
Alan xD
Or Brian

You could always go with Algernon! (which, I believe, is a name concerning moustaches?)

Thank you so much! These are all great suggestions. :)