Here are some additional "Mac" names which aren't correctly capitalised by Lingua-EN-NameCase-1.13:
Macomber
Mackin
Mackintosh
Macken
Machen
MacIsaac
Machan
Machiel
Maciol
Mackell
Macklem
Mackrell
Maclin
Mackey
Mackley
Machell
Machon