1 [loon]
any of several large, short-tailed, web-footed, fish-eating diving birds of the genus Gavia, of the Northern Hemisphere.

1625–35; perhaps alteration of loom3

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2 [loon]
a crazy or simple-minded person.

1400–50; late Middle English lowen, perhaps < Old Norse lūinn worn, tired; later influenced by loon1 and loony

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
loon1 (luːn)
the US and Canadian name for diver
[C17: of Scandinavian origin; related to Old Norse lōmr]

loon2 (luːn)
1.  informal a simple-minded or stupid person
2.  dialect (Northeast Scot) a lad
3.  archaic a person of low rank or occupation (esp in the phrase lord and loon)
[C15: origin obscure]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"diving bird" (esp. the Great Northern Diver), 1634, from a Scand. source (cf. Norw. lom, from O.N. lomr).

"crazy person," mid-15c., lowen "rascal," of uncertain origin, perhaps related to Du. loen "stupid person."
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Nearby reside the relics of elk and lynx, coyote and loon, pelican and wolf.
There was the stampede to see the migrating loon that chose the park's
  reservoir for a rest stop.
Anything published by this loon has zero credibility.
Obviously you are a left wing loon that is the problem not the solution.
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