Midday Connection, of Moody Broadcasting, interviewed Ace Collins, author of Stories Behind the Great Traditions of Christmas, last Wedsnesday. As the website archive says, "Ace talked with listeners about the history of Christmas trees, poinsettias, mistletoe, the Twelve Days of Christmas, Santa Claus, and other loved traditions surrounding the celebration of Jesus’ birth."
Ace mentioned only that the 10 lords a'leaping represented God's Ten Commandments, none of the other symbolisms. I was eager to find out more about the song's origin and history, but unable to order Ace's book. Here is a link to his site, in case anyone else is interested in the wonderful research he's done: Ace Collins
God bless your new year with His peace in every circumstance.