Malachy is an Irish name that comes from the Gaelic word 'Maol Seachnaill', which translates to 'devotee of St. John'. It is a traditional name in Ireland, with its usage dating back many centuries. The name gained prominence due to several high-ranking figures in Irish history who bore it, including Malachy II, a 12th-century King of Munster, and Saint Malachy, the patron saint of Ireland's northern county of Armagh.
The name Malachy experienced significant fluctuations in popularity over the years. While there were consistently 5 births per year from 1897 to 1931, it peaked at 35 births in 2002 and has since declined, with 18 births recorded in both 2022 and 2023. The total number of births is 666 over the entire period.