- Maccoy family
- MacKay family
- MacKays family
- McCay family
- McKays family
- found: Couch, S. The Martin Stanley McCay family and related lines, 1988 (McCay, Mackay, Mackey, Mackie)
- found: Am. fam. names (McCoy, Maccoy, McKay, Mackay, MacKey, McKee, Mackey, Mackie)
- 1986-02-11: new
- 1999-02-17: revised
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