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I found that 'leith' means 'wide river' in Scotch Gaelic. There is a section of Edinburgh down near the water that was known as Leith.

No luck on Plender...an Indo-European root book I have seems to indicate that it may have to do something with "to fill" or "to be full", but that's a long shot ...if it is related, then it would have a cognate in a word like 'plenty' ...