Ailein Duinn? though it's in gaelic... here are lyrics and translation:

Gura mise tha fo eislean
Moch sa mhaduinn is mi g'eirigh.

chorus: O hi Shiubhlainn leat
Hi rib ho, ho rinn o ho
Aillein Duinn, o hi shiubhlainn leat.

Ma 's'en clusag dhut a ghaineamh
Ma 'se leabaidh dhut an gheamainn.

Ma 's en t-iasg do choinlean geala
Ma 'se na roin do luchd-faire.


Translation:
I am full of sadness
Early in the morning as I rise.

chorus: I long to journey there with you.
Brownhaired Alan, I long to go with you.

The sand is your pillow
The seaweed is your bed.

The fish are the white candles at your deathbed
The seals keep watch over you.