Boher
Ellen (Mc?)Carthy of Kilkerran was baptized Boher in Ardfield & Rathbarry 01 Mar 1867 but registered as Carthy in the Rosscarbery office of Clonakilty.
Cnoic
The McCarthy yDNA project has identified mutations specific to the McCarthy Cnoics, which have been recorded as Cnoic, Cnoc, Knuck, and Cnuch.
Cnoic, Knuck, Cnuch ("of the hill") have been spotted in old records around Skibbereen, in Kilmacabea and Drinagh parishes, and eastwards into Kilmeen and Castleventry. The Letter from Dublin reference (above) mentions a Knogher an Cnoc as possibly a McCarthy from Desert in the Downe Survey.
This is an example from the TAB of Drinagh:
This is an example of a marriage in Drimoleague & Drinagh:
Creaig
Creaig might also be recorded as Craig, Cruig, etc. It has been spotted in Caheragh and Drimoleague & Drinagh records.
Meenig
Meenig might also be recorded as Meeny. The name appears well documented in Kilmacabea parish.
Sowney
Sowney might be recorded as Sowny, Souney, Souny, and maybe Sauny or Sawny.
A collection of McCarthy Sowney research is at groups.io.
The example shown below is from Clashduff in the 1826 Dromdaleague Tithe Applotment Book:
Caution is warranted when doing your research. Around Caheragh there were also people named Looney. L- and S- are often mistaken for each other and the surnames can be confused. Plus, it isn't safe to assume everyone named Sowney was a McCarthy. The same agnomen was used for the surname Brien around Rosscarbery and even a Collins family around Barleyhill.