(Hebrew קין) Also Kayin, Qayin or Cain; means ‘smith’, as in metal-smith, or more precisely as in blade-smith, a required skill (or kenning = knowing) of Alchemy (the melting of metals). Thus the name (Cain) in the Book of Genesis is a descriptive appellation to Alchemists.
"And Adam knew Eve his wife; and she conceived, and bore Cain, saying, I have acquired a man from the Lord." - Genesis / Beresheet 4:1
"The mind is called Cain. The mind is a hunter. The mind is hunting for fortunes, social positions, fame. This mind is utilized by the know-it-all-scoundrels in order to triumph; they feel they are wise and powerful with that animal lunar mind that is well-cultivated. [...] We must kill Cain, which is the lunar mind. This mind is worthless and it must be eliminated. It must be killed because it is animalistic." - Samael Aun Weor, Tarot and Kabbalah
"The third Root Race, the Lemurian people, arose (always by modification) from the Hyperborean. This race was the separating hermaphrodite Cain and Abel, which lived upon the gigantic continent of Mu, or Lemuria as it was later called, that was situated in the Pacific Ocean." - Samael Aun Weor, The Gnostic Magic of the Runes