“Twelve Days” was first published in 1780, but it existed as an oral tradition long before that. And even after it was published, the song was most often just passed down from generation to generation. Over time, lyrics change.
In the original published version, it’s “4 colly birds” not “4 calling birds.” In England at the time, “colly birds” was a name given to blackbirds.
The Three Blackbirds is a pub name new to me, but by no means unique, this example is from Flamstead, Hertfordshire.
The Blackbird is a pub well known to yours truly in Ponteland Northumberland.
- The Three Blackbirds, and the Blackbird =Four Calling birds
Regards Neil