"drink laced with chloral hydrate," by 1918. Mickey Finn was used from the 1880s as the name of the main character in a series of popular humorous Irish-American stories published by New York Sun staff writer Ernest Jarrold (1848-1912), who sometimes also used it as his pen-name. Perhaps there is a connection.
a name of God in the Bible, c. 1600, from Hebrew, plural (of majesty?) of Eloh "God" (cognate with Allah), a word of unknown etymology, perhaps an augmentation of El "God," also of unknown origin. Generally taken as singular, the use of this word instead of Yahveh is taken by biblical scholars as an important clue to authorship in the Old Testament, hence Elohist (1830; Elohistic is from 1841), title of the supposed writer of passages of the Pentateuch where the word is used.
masc. proper name, variant of Marcus (q.v.). Among the top 10 names given to boy babies born in the U.S. between 1955 and 1970.
Mark Twain is the pseudonym of American writer and humorist Samuel Langhorne Clemens (1835-1910), who had been a riverboat pilot; he took his pen name from the cry mark twain, the call indicating a depth of two fathoms, from mark (n.1) in a specialized sense of "measured notification (a piece of knotted cloth, etc.) on a lead-line indicating fathoms of depth" (1769) + twain.
1861, in reference to a type of extinct hominid, from German Neanderthal "Neander Valley," name of a gorge near Düsseldorf where humanoid fossils were identified in 1856.
The place name is from the Graecized form of Joachim Neumann (literally "new man," Greek *neo-ander), 1650-1680, German pastor, poet and hymn-writer, who made this a favorite spot in the 1670s. Adopting a classical form of one's surname was a common practice among educated Germans in this era. As a noun, by 1915; as a type of a big, brutish, stupid person from 1926. They were extinct by about 35,000 years ago. That they interbred with modern humans was long debated and denied, but DNA analysis settled the question in 2013: They did.