Knock magh is the spelling often used by writers who hold that the name means "Hill of the Plain".
"The Fairy-Faith in Celtic Countries"
W. Y. Evans Wentz
15. As hie eh as daill eh eh-hene rish cummaltagh jeh'n cheer shen; as hug eshyn eh magh gys ny magheryn echey dy ve son bochilley muickey.
"The English Language"
Robert Gordon Latham
Marriages are always celebrated during the months of magh and Phagun, and they are held only once in five or six years, when all children whose matches can be arranged for are married off.
"The Tribes and Castes of the Central Provinces of India Volume II"
R. V. Russell