Not a full list by any means list.
Taken from notes made over many years of research in the writing of "This Mighty Isle".
These listed, are the ones that raised my imagination.
Proper recognition to authors and book titles given at end,but Not in any order or detail.
My thanks to all these Authors.

"Myrddin"Meer-Thin [Merlin,Mydryn,]Son of Morvan.

"Mona" Isle of.Anglesey,[Moonland,Land of the Moonbright]Ynys Dowel,Blessed Isle,Dark isle,Ynys Dywyal.

"Meini"Caer.Manchester.

"Mistletoe"All-Heal.Special if found in the Valonia Oak.

"Mabon"Child.

"Modron"Mother.

"Mump"Mound for Faery meetings in England.Pagan Sacred site.i.e.Mumpss Bridge,Oldham.Lancs.

"Mabinogion"In the White book of Rhydderch.

"Mog Roith" Blind Druid.(Some say he was Simon Magus)He had a War chariot of Rowen wood.

"Math Ap Mathonwy"[Had the gift of Hearing whispers,even the quietest whisper once it had been caught by the Wind](Math was cured so that,exept in time of War,he must have his feet resting in a Virgins Lap else "He would die")

"Morgan La Fay"[Morrigan,Morgaine,Morgana,Dark Lilith of This Mighty Isle,Morgan,

"Modhrauith"Druid of Fiachadh Muilleathan,King of Munster.[He enchanted a dart and flung it into the air with all his might and where it landed Sprang a Fountain of the purist water]

"Merch-Ur" Celtic for WomanMan.

"Magregor Ried"Curse on E.Antrobus,who stopped entrance to the Stonehenge.[In grief and sorrow i call down the curse of almighty god and of his spirit messengers that the weak may be liberated from the molestations of the Tyranical.end with a chant--Not Included Here]

"Myrmidons" Of Thessaly.An Ant clan subject to the Goddess "Wryneck"

"Moir"Caer,Stonehenge,Caer Mhor,[Cor Gaur, great circle,Cymric][Cathoir Ghall,Choir of Giants Galic][Claudair Cyfrngon,Old Welsh Tryads]

"Meythra" Battle of.[Balor the one Eyed King of the Old Gods cried out." I wonder that the Sun as risen in the west today;His Druid answered"Wouldst it be that it were no more that the Sun"]

"Merry Thought" Pulling a wishbone at the Goose feast.Autumn Equinox.

"Mead" Honey,Water,Malt,and Yeasts.

"Mary Magdalina" Gave birth on the 15th Septemeber 33c.e. a child female,"Tamar(Palm Tree)Greek-Damaris.2nd Child Jesus Justus,3rd Joseph.

"Magi" Quote.[ "And man unlike all living creatures upon the earth is twofold,He is mortal by reason of his body,He is immortal.and has all things in his power,yet he is suffers the lot of mortals,being subject to fate.He is exalted above the structure of the heavens,yet he his born a slave of fate"]

"Mithras"1400b.c.e. Eastern Sun God "Sol"first encountered by the Romans in Persia" [A chapel dedicated to MITHRAS is hidden beneath the Vatican of Rome.] [Mithras birth ceabrated on December 25th]

"Mandylion" [The Portrait of Christ]Commisioned by Antiochus1c,e,King of Commagene]

Book of Druidry(Ross Nichols)Mythology of the British Isles(Geoffrey Ashe)Ancient Faith of Britain(Dudley Wright)Druid Way(P Carr-Gom)Druid Renaissance(P Carr-Gom)The Encyclopedia of Celtic Wisdom(Caitlin and John Matthews)Glastonbury,Avalon off the heart(Dion Fortune)The White Goddess(Robert Graves)Druidry(Philip Shallcrass)Avalonian Quest(Geoffrey Ashe)Druid Animal Oracle(Philip and Stephanie Carr-Gom)Arthurian Myth and Legend(Mike Dixon-Kennedy)The Voice Within the Wind(Greywind) The Druid Sourse Book(John Matthews)Gods of the Celts(Miranda Green)The Lore of the Bard(Arthur Rowen)The Celtic Year Book(John King)Pagan Pathways(Emma Restall-Orr)Act of God(Philips)Bloodline of the Holy Grail(Laurence Gardner)Dead Sea Scrolls Deception(Richard Leighand Michael Baigent)Magi(G Ash)Witches,Druids and King Arthur(Ronald Hutton)Living Druidry(Emma Restall-Orr)The mystical Qabalah(Dion Fortune)Secrets of the Druids(John Matthews)