[1] : Easton's 1897 Bible Dictionary

lamech
   the strikerdown; the wild man. 1. the fifth in descent from
   cain. he was the first to violate the primeval ordinance of
   marriage gen. 4:18-24. his address to his two wives, adah and
   zillah 4:23, 24, is the only extant example of antediluvian
   poetry. it has been called "lamech's sword-song." he was "rude
   and ruffianly," fearing neither god nor man. with him the
   curtain falls on the race of cain. we know nothing of his
   descendants.
   
     2. the seventh in descent from seth, being the only son of
   methuselah. noah was the oldest of his several sons gen.
   5:25-31; luke 3:36.
   

[2] : Hitchcock's Bible Names Dictionary (late 1800's)

lamech, poor; made low

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