Correction the Mary in "The Mountains Of Mourne" song is not Mary with a surname of Macree, but it is in fact "Mary, Mo Chroí" -------- mo chroí translates as "my heart" and in normal usage, coupled with a person's name, it means a term of endearment such as "my beloved one" or "my love".
Back to the list :-
Shallow Brown
Dick Darby (from the late Tommy Makem's cobbler song)
Billy Reilly (by Hanging Johnny Shanty Crew, Cornwall)
Captain Burgess (The Leaving of Liverpool)
Anachie Gordon (By Mary Black, Ireland)
Nell Flaherty's Drake
Me and Bobby McGee (Kris Kristofferson, Canada)
Bo Diddley (by Buddy Holly, USA)
Robin (The Hooded Man) Hood (by Clannad, Ireland)
I Just Shot John Lennon (by The Cranberries)
Boadicea --- if she had a surname nobody's told me! (by Enya, Ireland)
Married My Jenny Wren Bride (by Hanging Johnny Shanty Crew, Cornwall))
Maggie May (by Rod Stewart, Scotland)
Bonnie Suzie Clelland (by Hen Party, England)
Nancy Spain (by Imrama, Ireland)
Bonnie Wee Jeannie MacColl (by Jim Brannigan, Scotland & Canada))
Johnny Groat (by Jim Wearne, USA)
Mrs. Harris (by Joe Stead, England))
I'm Bad Like Jesse James (by John Lee Hooker, USA)
Tom Bawcock's Eve (by Julie Elwin and Naked Feet, Cornwall))
Cecelia Brown (by Kath Tait)
Elspet Blythe-Stone (by Kath Tait)
Harry Eddon (by Kimber's Men Shanty Crew, England)
Rory Murphy (by The McAlmans, Scotland)
Sister Josephine (by The McAlmans)
Maggie Johnston (by Mickey MacConnell, Ireland)
Teddy O'Neill (by The Midden, Scotland)
Annie Laurie (by The Midden)
I Feel Like Buddy Holly (by Mike Batt, England)
Oliver Cromwell (by Monty Python, UK)
Mr. Bojangles (by Neil Diamond)
Mr. Moon (by Nicola Clark, Cornwall)
Mick McGuire (by Robin Hall & Jimmy MacGregor, Scotland)
Jack Caundle (by Ron Taylor & Jeff Gillett, England)
John Lomas (by Seth Lakeman, England)
Kitty Jay (by Seth Lakeman)
Jimmy Newman (by Tom Reid)
Tim Finnegan (from "Finnegan's Wake" by the Dubliners, Ireland)
Roger Casement (from the Irish song "Banna Strand")
Willie Taylor (by The Voice Squad, Ireland)
Pádraig Pearse (by The Wolfetones, Ireland)
And then there's the full listing of crew names in the song "The Irish Rover" ---- including Slugger O'Toole, Barney MacGee, Mick MacGann, Bill Treacy and Johnny Mac Gurk. and a similar listing of the people who went to "Widdecombe Fair", along with Uncle Tom Cobley and all.
Please note : where I mention song is "by" a group or performer, I mean "as performed by", not as composed by, though in some cases, the performed mentioned has written the song