Mckelly Family History
Mckelly Surname Meaning
from Mac Ceallaigh ‘son of Ceallach’. See Kelly. In Ireland and IoM the surname was generally reduced to Kelly.
In Scotland if the final fricative /x/ was pronounced it is possible that mac might be dropped to result in Killough.
Dropping of final /x/ might result in the spelling o in Scotland.
There may have been some confusion with McCulloch.
Source: The Oxford Dictionary of Family Names in Britain and Ireland, 2016
