Name
- Morgan Talai1
- Morgan ab Hywel ab Tudyr1
- Morgan, James, of Add MS 149351
- Morgan, Jane, mother of Rowland Morgan1
- Morgan, Rowland1
- Morris, Family1
- Morris, Henry, of Add MS 148981
- Morris, Robert, of Add MS 149571
- Mortimer, Roger, of Add MS 149351
- Morys Richard1
- Morys ab Howel1
- Morys ab Llywelyn1
- Mostyn, Family1
- Nicaise, Claude, Abbé; French antiquary1
- Nicolson, William, Bishop of Carlisle (1702), of Derry (1718), and Archbishop of Cashel (1727)1
- Owain Twna1
- Owen, Edward, of Add MS 149041
- Owen, Humphrey, of Add MS 148661
- Owen, Jane1
- Owen, John, MP for Anglesey1