"popcorn ball," 1843, from corn (n.1) + ball (n.1). The adjectival meaning "trite and old-fashioned" (by 1949 in Billboard magazine) probably is an elaboration of corny in this sense; cornball "a corny person" is noted in African-American vernacular by 1946.
corky
corm
cormorant
corn
corn flakes
cornball
cornbread
corn-cob
corn-crib
corn-dodger
corn-dog
)window.location='https://www.paypal.com/cgi-bin/webscr?cmd=_donations&business=byronic106@yahoo.com&lc=US&item_name=Donation+to +Help+Keep+Etymonline+Free+and+Open&no_note=0&cn=&curency_code=USD&bn=PP-DonationsBF:btn_donateCC_LG.gif:NonHosted'){kind=link}