Heroin
late 19th century: from German Heroin, from Latin heros ‘hero’ (because of its effects on the user's self-esteem).
wiktionary
Since the 1890s, from German Heroin, originally a trademark said to derive from Ancient Greek ἥρως(hḗrōs, “hero”) (due to the feelings of power and exaltation while under the influence of the drug) and the suffix -in(“-ine”). Alternatively explained as reference to the heroic school of medicine. [1]
etymonline
heroin (n.)
1898, from German Heroin, coined 1898 as trademark registered by Friedrich Bayer & Co. for their morphine substitute. According to tradition the word was coined with chemical suffix -ine (2) (German -in) + Greek hērōs "hero" (see hero (n.1)) because of the euphoric feeling the drug provides, but no evidence for this seems to have been found so far.
A new hypnotic, to which the name of 'heroin' has been given, has been tried in the medical clinic of Professor Gerhardt in Berlin. [The Lancet, Dec. 3, 1898]
