In the case of Irish songs,you are overlooking the important role of the Enigmatic Tune-names Board, which meets quarterly and passes on proposed names for new tunes.

The Board is the hidden force behind "She Moved Through the Fair" as well as "Upstairs in the Tent," "Whistle and She'll Come to You" "Dennis Don't Be Threatening" and "All Covered with Moss."

I'm surprised you haven't heard of it.