No McTarnahan households in Griffith's.
| MacTernaghan | rare: Belfast area. Ir. Mac Tighearnacháin, dimin. of tighearnach, lordly. |
| Ternaghan | rare: Belfast. Ir. ? Mac Tighearnacháin, perhaps a diminutive of tighearnach, lordly. |
Parishes where McTarnahan and a second surname are found together
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