Those other Clancy brothers, from Co Tyrone, I was thinking about, called their group "The Irish Ramblers". https://soundcloud.com/gene-clancy/the-patriot-game-by-the-irish
Discography https://www.theballadeers.com/noa/mnf_irishrambers.htm
A bit of thread drift as there is no indication that they ever recorded the Mingulay Boat Song, but I needed to correct info. from a previous message.