[2] Its earlier origin is from the Latin "magnus", meaning "great".
The Normans used it to honour Charlemagne (742–814), as Carolus Magnus (Charles the Great).
[3] Variant spellings of the name include MacManus, Manus and MacManners.
[1] The English form, Moyne, is also found in Ulster.
[4] There are two principal septs of the name in Ireland:[3] Notable people with the surname include: