- Name - MACARTAN
Meaning - SON OF ARTAN
- Name - MACAULIFFE
Meaning - SON OF OLAF
- Name - MACBRIDE
Meaning - SON OF BRIDGET BRIDE
- Name - MACCORMACK
Meaning - SON OF CORMAC
- Name - MACELROY
Meaning - SON OF ELROY
- Name - MACLEAN
Meaning - SON OF LEANDER
- Name - MACMAUREADHAIGH
Meaning - SON OF MURRAY
- Name - MACMURRA
Meaning - SON OF MURRAY
- Name - MACQUAID
Meaning - SON OF QUAID
- Name - MAD\ULEY
Meaning - SON OF OLAF
- Name - MADDEN
Meaning - SMALLDOG MILOS
- Name - MAELEACHLAINN
Meaning - SERVANT
- Name - MAELISA
Meaning - SERVES CHRIST
- Name - MAGEE
Meaning - SON OF HUGH
- Name - MAGEE
Meaning - SURNAME
- Name - MAGO
Meaning - GREAT
- Name - MAHER
Meaning - GENEROUS
- Name - MAHON
Meaning - BEAR
- Name - MAHONEY
Meaning - SURNAME
- Name - MAHONEY
Meaning - BEAR
- Name - MAINCHIN
Meaning - MONK
- Name - MAL
Meaning - CHIEF
- Name - MALACHY
Meaning - MESSENGER OF GOD
- Name - MALACHY
Meaning - SERVANT
- Name - MALLOY
Meaning - NOBLE CHIEF
- Name - MALONE
Meaning - SERVES SAINT JOHN
- Name - MALONE
Meaning - CHURCH GOING
- Name - MALONEY
Meaning - SERVES SAINT JOHN
- Name - MALONEY
Meaning - CHURCH GOING
- Name - MALVIN
Meaning - CHIEF
- Name - MANE
Meaning - GREAT
- Name - MANNIX
Meaning - MONK
- Name - MANNUSS
Meaning - GREAT
- Name - MANUS
Meaning - SURNAME
- Name - MAOLRUADHAN
Meaning - SERVES SAINT RUADHAN
- Name - MAONAIGH
Meaning - WEALTHY
- Name - MARCAS
Meaning - OF MARS
- Name - MAUGHOLD
Meaning - NAME OF A SAINT
- Name - MCCOY
Meaning - SURNAME
- Name - MEADE
Meaning - HONEY WINE OR MEADOW
- Name - MEADHRA
Meaning - HAPPY
- Name - MEARA
Meaning - HAPPY
- Name - MELRONE
Meaning - SERVES SAINT RUADHAN
- Name - MELVIN
Meaning - ARMORED CHIEF
- Name - MELVIN
Meaning - CHIEF
- Name - MELVYN
Meaning - ARMORED CHIEF
- Name - MELVYN
Meaning - CHIEF
- Name - MERV
Meaning - LOVER OF THE SEA
- Name - MERVIN
Meaning - LOVER OF THE SEA
- Name - MICK
Meaning - WHO IS LIKE GOD
- Name - MICKEY
Meaning - WHO IS LIKE GOD
- Name - MIKEAL
Meaning - WHO IS LIKE GOD
- Name - MILES
Meaning - SERVANT
- Name - MOGUE
Meaning - NAME OF A SAINT
- Name - MOLAN
Meaning - SERVANT OF THE STORM
- Name - MOLLI
Meaning - BITTER
- Name - MOLLOY
Meaning - NOBLE CHIEF
- Name - MONOHAN
Meaning - MONK
- Name - MOONEY
Meaning - WEALTHY
- Name - MOORE
Meaning - SURNAME
- Name - MORAIN
Meaning - GREAT
- Name - MORAN
Meaning - GREAT
- Name - MORGAN
Meaning - FIGHTER OF THE SEA
- Name - MORIARTY
Meaning - EXPERT SEAMAN
- Name - MORIARTY
Meaning - SEA WARRIOR
- Name - MORRISSEY
Meaning - CHOICE OF THE SEA
- Name - MOSS
Meaning - MARSHLAND
- Name - MUIRCHEARTAIGH
Meaning - EXPERT SEAMAN
- Name - MUIREADHACH
Meaning - LORD OF THE SEA
- Name - MUKONRY
Meaning - HOUND OF PROSPERITY
- Name - MULCAHY
Meaning - BATTLE CHIEF
- Name - MUNDY
Meaning - FROM REAMON
- Name - MURCHADH
Meaning - FIGHTER OF THE SEA
- Name - MURPHEY
Meaning - SEAWARRIOR
- Name - MURPHY
Meaning - SEAWARRIOR
- Name - MURRAY
Meaning - LORD OF THE SEA
- Name - MURROUGH
Meaning - FIGHTER OF THE SEA
- Name - MURRY
Meaning - LORD OF THE SEA
- Name - MURTAUGH
Meaning - SURNAME
- Name - MYLES
Meaning - SERVANT
