Family name Mc Nish (Mc Nish 
) , throughout the world, is a very rare cognomen. The last name Mc Nish is habitual in Trinidad and Tobago, where it is quite a rare surname, Costa Rica, where it is a very rare surname, and the United States, where it is an extremely rare surname. Measured by absolute frequency, it is the most numerous in the United States, Trinidad and Tobago, and the United Kingdom.
| VARIANT | COUNTRY |
|---|---|
| Mc Nish | South Africa, Canada, United Kingdom, United States, Trinidad and Tobago |