Why corn is called corn?

Answer 1

cuz it is

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It might not help much, but please see the related link below.

corn (1)"grain," O.E. corn, from P.Gmc. *kurnam "small seed" (cf. O.Fris., O.S. korn "grain," M.Du. coren, Ger. Korn, O.N. korn, Goth. kaurn), from PIE base *gre-no- "grain" (cf. O.C.S. zruno "grain," L. granum "seed," Lith. žirnis"pea"). The sense of the O.E. word was "grain with the seed still in" (e.g. barleycorn) rather than a particular plant. Locally understood to denote the leading crop of a district. Restricted to corn on the cob in America (c.1600, originally Indian corn, but the adjective was dropped), usually wheat in England, oats in Scotland and Ireland, while korn means "rye" in parts of Germany. Maize was introduced to China by 1550, it thrived where rice did not grow well and was a significant factor in the 18th century population boom there. Cornflakesfirst recorded 1907. Corned beef so called for the "corns" or grains of salt with which it is preserved; from verb corn"to salt" (1560s).