Tartan
which occurs only in 2Ki 18:17 and Isai 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.
Bibliography Information Smith, William, Dr "Definition for 'Tartan' Smiths Bible Dictionary". bible-history.com - Smiths; 1901.