McNeill family Cushendall/Cushendun

#1
In researching my McNeill family roots in Antrim around the Cushendall/Cushendun area in the 1800’s, I came across a reference to McNeill (Rocks) and McNeill (Park).
Can anyone explain the significance of these terms? I am curious as to their meaning.
 
#2
You haven’t said where you found these references, but I’ll guess it was in Griffiths Valuation. In Griffiths if there were 2 or more people of the same name in a townland, the compilers were instructed to use an agnomen (ie an additional word or name) to distinguish them. That agnomen could be a name eg a wife’s maiden name, a nickname, an occupation or a local place name.
 
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