Smith's Bible Dictionary
Tar'tan. Tartan, which occurs only in 2 Kings 18:17 and Isaiah 20:1, has been, generally, regarded as a proper name; like Rabsaris and Rabshakeh, it is, more probably, an official designation, and indicates the Assyrian commander-in-chief.
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Smith, William, Dr. Entry for 'Tartan'. Smith's Bible Dictionary. https://www.studylight.org/dictionaries/eng/sbd/t/tartan.html. 1901.