Coke
late Middle English (in the sense ‘charcoal’): of unknown origin. The current sense dates from the mid 17th century.
wiktionary
Perhaps from Middle English colk(“core”).
Originated circa 1908 in American English as a clipping of cocaine.
1909, from the name of the American company Coca-Cola and the beverage it produced; the drink was named for two of its original ingredients, coca leaves and cola nut.
etymonline
coke (n.1)
"fuel residue, solid product of the carbonization of coal,"an important substance in metallurgy, 1660s, a northern England dialect word, perhaps a variant of Middle English colke "core (of an apple), heart of an onion" (c. 1400), also "charcoal" (early 15c.), a word of uncertain origin. It seems to have cognates in Old Frisian and Middle Dutch kolk "pothole," Old English -colc, in compounds, "pit, hollow," Swedish dialectal kälk "pith." Perhaps the notion is the "core" of the coal, or "what is left in the pit after a fire."
Coke
soft drink, 1909, a popular shortening of the brand name Coca-Cola, perhaps influenced by the earlier slang use of coke for cocaine (another popular early name for the soft drink was dope).
coke (n.2)
slang shortened form of cocaine (q.v.), by 1902, American English.
