Secret Santa

Secret Santa
/ˌsiː.krət ˈsæn.t̬ə/

1) an arrangement in which each person in a group buys a Christmas present for one other person, without the person knowing who bought the present:
Do you want to be in the office secret Santa?

2) a person who buys a present in this arrangement:
I wonder who my secret Santa was!

Merry Christmas!!! ??