I see from the link to a previous thread (posted above by Masato Sakurai) that somebody wrote that the song was written by Delia Murphy. Can this be true? Delia Murphy was a well-known Irish ballad singer. There's a Dan O'Hara cottage in Connemara, but it's not a Connemara song: nor by a known local author or containing any local style or references. The words read more like Tin Pan Alley to me.
Jesse Owens also recorded it.