McKoy is a surname. Notable people with the surname include: Millie and Christine McKoy (1851–1912), siamese twins, "The Two-headed Nightingale" David McKoy (born 1983), Canadian football player Grainger McKoy (born 1947), American artist Lorna McKoy, West Indian cricketer Mark McKoy (born 1961), Canadian/Austrian hurdler Nick McKoy (born 1986), English footballer Noel McKoy, English soul singer Olivia McKoy (born 1973), Jamaican javelin thrower Wayne McKoy (born 1958), American basketball player