You may have been on the right track originally.

"Ireland, like modern Central Africa, would receive all her civilised weapons from her neighbours. The Picts of Scotland would transmit a knowledge of iron-working and of the Sword to the Scotti or Picts of the north-east of Hibernia. This is made evident by the names of the articles. CLAJDEAM or CLAJDJM, the Welsh kledyv, is simply gladius; and TUCA is ‘tuck,’ or a clerk’s Sword."---http://www.jrbooksonline.com/HTML-docs/Book_of_the_Sword.htm