The National Trust registry doesn't show the name MacClive (or similar) in the 1881 or 1998 census as having more than 100 instances in the U.K. so it's very rare indeed.
I did come across a thread elsewhere that links it to Stewart of Appin but then quotes the Stewart Society as saying it is not a sept of theirs and that it is probably Irish.
The Surname Database doesn't list the name
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