This is a standard of the folk scene in Ireland and wherever the Irish diaspora gather. It’s a lament for the emigrants and their descendants who live around the world. It can be difficult for those from some other nations to fully understand the emotional connections that Irish people have for their place of birth. Yet, given that there are Hiberno-English, Hiberno-Scots, Irish-Americans, Irish-Aussies and many others who have never been to Ireland but still retain a great grá, or love, for the land of their parents and grandparents, perhaps it can be said that the ties to Ireland are passed from parent to child via ethnic memory.
It might well be that a love for Ireland is in the genes and in the blood.