Possibly a plural noun or a surname; in standard English this is not a recognized common word with a clear definition.
Could be a plural of an obsolete or dialectal term, or a proper name; without clear historical documentation, the etymology is uncertain.
Copps is interesting because it shows up primarily as a surname (like the Copps family in Canada), reminding us that many English surnames come from old occupations or place names we no longer recognize.
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