I'm following the Holt family of Ireland and my branch is connected with both Byrne(s) and Carroll families. I have a Patrick Byrne (mariner) who's father was Lawrence Byrne, a corn dealer. Patrick married Letitia Holt in Liverpool England in 1845. Their witnesses were Michael Carroll and Ann Carroll. I don't know which part of Ireland they come from but it could well be Kildare as there are other Holt families there.