Coming a bit late to this conversation, but I am conducting research into the Courtown Estate and have come across the words to this song in the Schools' Folklore collection. The link is here: http://www.duchas.ie/en/cbes/5009258/5002283

The lyrics are similar to those posted here but there are differences e.g. the most charming maid becomes mermaid. Also I wonder if it was sung to a different tune, as it seems that the last line was repeated?

Rachel