Monday, Munday, Mundy - Anglicised Surnames in Ireland

Padraig Mac Giolla-Domhnaigh
1923

Monday, Munday, Mundy—These three names in S. West Ulster and adjoining parts of North Connacht, particularly in the County of Cavan, Lisnaskea in Co. Fermanagh, and Clones, Co. Monaghan, are the anglicised forms of McAloon, M'Clune, and M'Lune; in Gaelic Mac Giolla-Eóin.

Alphabetical Index of Anglicised Surnames in Ireland

See also Woulfe’s Irish Names and Surnames
and O'Hart's Irish Pedigrees