Translators may want to add a footnote that says: "This name sounds like the Hebrew word that means 'rest.'" (See: [[rc://en/ta/man/translate/translate-names]]).
Lamech says the same thing twice to emphasize how hard the work was. AT: "from working so hard with our hands" (See: [[rc://en/ta/man/translate/figs-doublet]] and [[rc://en/ta/man/translate/figs-synecdoche]])