I was always led to believe that the meaning of the name "Mavemacullen" was "The Plain of the Mills." Some authorities would disagree. Through the Parish of Loughgilly flows the River Cusher used in the past as the source of power for many mills.
Over the years the spelling of the name of the townland has varied greatly. The earliest written form I have found is in the Hearth Money Rolls of 1664-65 when it was referred to as "Moy McCullen". Other versions are: