Easton's Bible Dictionary (1897)
V. , “valorous men;” others interpret this word as meaning “short-swordsmen,” or “daring ones”, the name of a class of men who were defenders of the towers of Tyre.
Smith's Bible Dictionary (1863)
This word occurs only in (Ezekiel 27:11) A variety of explanations of the term have been offered.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
GAM'MADIM (Hebrew, brave soldiers). Eze 27:11. The prevailing opinion respecting this term is that it is rather descriptive of the men of Atvad, V. 11, than the name of any particular people.