Cognomen Demijohn (Demijohn 
) , across the world, is a very rare surname. The family name Demijohn is characteristic of Northern America, particularly the United States, where it is a very rare surname. Much less frequently, Demijohn is the forename as well as the last name.
John, Allison, Cameron, Crystal, Bradley, Kristin, Promise, Maureen, Russell, Timothy, Eleanor, Francis, Kathleen, Kimberly, Laurissa, Deborah, Fatiha, Trevor, Joseph, Todd, Megan, Chris, Kathy, Debra, David, James, Frank, Irene, Angela, Ronald, Dennis, Debbie, Daniel, Jackie, Jennifer, and Christine