Derrill is an American-origin boy's name coined by author Stephen King for his fictional character in the Dark Tower series, first appearing in "The Gunslinger" (1982). Despite its unknown meaning, Derrill has gained some popularity with various spellings like Derril, Derill, and Derrall. It is considered relatively uncommon, with only 5 boys named Derrill born in the U.S. in 2018 out of approximately 730,000 total births that year.