Dain is a surname, and may refer to:Alphonse Dain (1896–1964), French Hellenist Claudia Dain, American author of romance novels Guy Dain (1870–1966), British physician Jack Dain (1912–2003), British–Australian Anglican bishop Killian Dain, Irish wrestler Mungau Dain (1994–2019), ni-Vanuatu actor and villager Ralph Dain (1862–?), English footballer