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1.
Someone from the state of Iowa
Luke:"He's an Iowan, because he lives in Iowa"

Mr.Anal "wow no way!"
by Luke Johnson, Iowan February 23, 2005
 
2.
Any really kool giant that lives in the
area of the U.S. 90° to 96° W and 40° to 43° N

Also the adjective describing something from that area.
That 7-ft tall gal must be Iowan.
by Bandita Chinchilla March 18, 2009
 
3.
Only used in Wales, means the same as 'Keith' in England. A geek or nerd, someone without a clue who is usually a bit anal.
God, you're acting like a right Iowan
by Andy Williams September 20, 2003