Etymology
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Watusi (n.)

ethnic group in Rwanda and Burundi (also called Tutsi), 1899. As the name of a popular dance, attested from 1964.

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Dodecanese 

group of islands in the southeastern Aegean, from Latinized form of Greek Dodekanesa, literally "the twelve islands," from dōdeka "twelve" (see dodeca-) + nēsos "island" (see Chersonese). 

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Symbionese (adj.)
in Symbionese Liberation Army (SLA), name adopted by a socialist revolutionary group active in U.S. 1972-76, coined from simbion "an organism living in symbiosis, from symbioun (see symbiosis) + people-name ending -ese.
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Moluccas 

island group of Indonesia, the Spice Islands, attested in French by 1520s as Moluques, from Malay Maluku "main (islands)," from molok "main, chief," perhaps so called for their central location in the archipelago.

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Pentothal 
trademark name of an anaesthetic and hypnotic, 1935, refashioning of Thiopental, from pento-, in reference to the methylbutyl five-carbon group (from PIE root *penkwe- "five") + first two letters of thiobarbiturate + chemical product suffix -ol.
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Sauk (2)
southern Coastal Salishan group of Native Americans, from a native Lushootseed name, probably folk-etymologized by influence of Sauk (1).
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Sandinista (n.)
member of a Nicaraguan revolutionary group, 1928, from Spanish, from name of Augusto César Sandino (1893-1934), Nicaraguan nationalist leader; the modern organization of this name was founded in 1963. Related: Sandanistas.
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A.A. 

also AA, abbreviation of Alcoholics Anonymous, attested by 1941, American English. The group name was the title of a book published in 1938 by the founder, Bill W. From 1914 as an abbreviation of anti-aircraft guns.

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Sweet Adeline 
female barbershop singing group member, 1947, from the name of a popular close harmony song by Richard Armstrong & Harry Gerard, "You're the Flower of my Heart, Sweet Adeline" (1903).
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Catawba (n.)

type of American grape, 1857, the name taken from the river in the Carolinas, in which region the grape was found. The river is named for the Katahba Indian group and language (Siouan), from their word katapu "fork of a stream," itself a Muskogean loan-word meaning "separate."

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