Family name Kosac (Kosac 
) , around the world, is a rare surname. The last name Kosac is characteristic of Croatia, where it is a rare surname, Czechia, and Australia, where it is a very rare surname. Not in comparison with a country's population, it is the most numerous in the United States, Czechia, and Croatia.
Mr, Miguel, Silvia, Sergio, Steven, Angela, Carrie, Camila, Daniel, Jacobo, Jerome, Jeanne, Judith, Thaiza, Nicole, Edward, Victor, Michael, Stephen, Spencer, Antonio, Anthony, Elena, Julie, Julia, Jorge, Ms, Ana, Mara, Mike, Miki, Brad, Paul, Ruth, John, Tomy, Colleen, Maria, Salma, Amber, Carla, Craig, Brian, Kathy, Pavol, David, Donna, James, Marci, and Barbara