Etymology
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Van Allen 
name of radiation belts around the Earth (and certain other planets), 1959, from U.S. physicist James A. Van Allen (1914-2006), who reported them in 1958.
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Allen 
masc. proper name and surname, variant of Alan (q.v.). In reference to a wrench, key, screw, etc. with a hexagonal socket or head, 1913, from the Allen Manufacturing Company of Hartford, Connecticut, U.S.
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van (n.1)
"front part of an army or other advancing group," c. 1600, shortening of vanguard.
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van (n.2)
"covered truck or wagon," 1829, shortening of caravan. Century Dictionary suggests this was perhaps regarded as *carry-van.
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van de Graaff 
in reference to an electrostatic charge generator, 1934, named for U.S. physicist R.J. van de Graaff (1901-1967).
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Rip Van Winkle 

"person out of touch with current conditions," 1829, the name of the character in Washington Irving's popular Catskills tale (published 1819) of the henpecked husband who sleeps enchanted for 20 years and finds the world has forgotten him.

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Microsoft 

computer software company, founded 1975 by Bill Gates and Paul Allen.

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Roosevelt 

the presidential family in America originally bore the name Van Roosevelt, "of the field of roses," descriptive of their estates in Holland. Claes Martenszen Van Rosenvelt, emigrated to New Amsterdam 1649. His son (1653) and all his descendants dropped the "Van." Related: Rooseveltian.

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nekton 

collective name for free-swimming aquatic creatures, 1893, from German nekton (van Heusen, 1890), from Greek nekton, neuter of nektos "swimming," from nekhein "to swim" (from PIE root *sna- "to swim"). Compare plankton.

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Tasmania (n.)
1853, named for Dutch navigator Abel Tasman (1603-1659), who discovered it in 1642. It was called by him Van Diemen's Land for the Dutch governor-general of the East Indies. The Tasmanian devil so called at least since 1829, from its propensity for killing young lambs (other voracious fish or animals also have been named devil).
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