HenrySpent ten minutes this evening playing the 'wrong' versions, according to Child B, of 'Felice Navidad'.
Apparently it's spelt 'Feliz Navidad', but going by the number of results for the incorrect spelling, I'm not alone in doing it wrong.
I've now been taught that this is the right one, the original by José Feliciano https://open.qobuz.com/track/245887