The Christmas carol God Rest Ye Merry Gentlemen is one of my favorite. I love the way it sounds on the ocarina.
Silent Night sounds beautiful on the 12 hole ocarina. It doesn’t fit on the 6 hole ocarina note range unless you overblow or underblow, but here is the tablature for the 12 Hole Ocarina (requested by my wife).
I like the how the tones of We Three Kings of Orient sound on the 12 hole ocarina.
The Little Drummer Boy is one of my favorite Christmas melodies, and it sounds great on a 12 hole ocarina too.