No doubt you are right Felipa, but this is one that I turned up on my computer, there are another thirteen verses which makes it seem more likely as a poem than a song.

A Íosa, an éisdir mo dhán?

[McKenna, L.: Dánta do chum Aonghus Fionn Ó Dálaigh, Dublin 1919, poem 20]

Do Chríosd

1 A Íosa an éisdir mo dhán
fíoch ar do bhréithir ná bíodh
ag so an tí fa bhfuile fuar
a uan Mhuire a Rí na ríogh.

2 Maith thuillim t’fheirg is t’fhíoch
fan gceird do [chuireas] i ngnáth
is foghar leathtruim gan luach
moladh luath chleachtaim do chách.