Aww I understand that you might feel embarrassed but please don’t! It was a completely harmless mistake and I’m sure it’ll be a nice laugh between you and the team in future! Honestly the best time to make this „mistake“ was when you did - no one had bought presents yet or put too much thought in. And often names have to be redrawn anyway because the last person chooses their own name, so you’re really really completely fine :)

This is one of those things that seem like it should be illegal (read receipts without the recipients consent)