An Irish surname derived from the Gaelic "McNuallaidh" meaning "descendant of the grandson" or "son of the devotional one".
In the 1881 census there were 104 people recorded with the Mcnalley surname, ranking it #19,296 among surnames in the records. By 2016, the modern count was 8, ranked #37,829, down from #19,296 in 1881.
The strongest historical links point to Wolverhampton, Lanchester (Collierley, Kyo, Billingside, Medomsley, Ebchchester, Benfieldside, Heelyfield, Conside and Govan Combination. In the modern distribution records, the strongest local clusters include No data.
Across the surname records, the highest recorded count for Mcnalley is 104 in 1881. Compared with 1881, the name has fallen by 92.3%.