I just noticed some schools are preparing to start their staff Secret Santa. Last year our supervisor organized our departments Secret Santa using https://www.elfster.com/.
It was a nice technology twist on something that typically is done, in a very confusing manner, by paper and pencil.
The site is free to use and participants sign up, if they are participating, and they can add what they like as far as drinks, snacks, etc. to help out the person they get paired with. The system then randomly pairs people up so you don't have to do it. It is pretty cool and something you might want to pass on to whoever handles your school's Secret Santa sign up.
My supervisor has a large extended family and she uses it with them as well. It is very easy to use and would save your organizer man hours as well as help keep the copies down at your school.
Have a great holiday season everyone!