Arthur, William (1857) An Etymological Dictionary of Family and Christian Names. New York: Sheldon, Blakeman. Public Domain.
MCCALLEN
As described in historical dictionaries
An Etymological Dictionary of Family and Christian Names (1857)
The son or descendants of Callen or Colin. This name was given to the descendants of Sir Colin Campbell, or Colin the Great, who flourished toward the end of the thirteenth century, at Lochore, Scotland.