Cognomen Keiu (Keiu 
) , worldwide, is an extremely rare last name. The surname Keiu is characteristic of Estonia, where it is a rare surname, Malaysia, where it is an extremely rare surname, and the United States. Much more frequently, Keiu is the forename as well as the last name.
Soe, Paapsi, Pirnpuu, Rebane, Tärno, Nguyen, Merimaa, Sokolov, Kruuse, Kadarik, Raudsepp, Gahagan, Jaansalu, Anderson, Kransiver, Tetsmann, Woodburn, Kiisler, Kasela, Kalaus, Meesak, Lam, Saar, Simm, Kask, Reks, Doan, Hirv, Sibul, Kasho, Kasch, Kriit, Duong, Grove, Talve, Telve, Trinh, Virro, Roosimägi, and Friedenthal