Worldwide, Trefil (Trefil 
, Трефил 
) is an extremely rare boy's first name. Much more frequently, Trefil is the last name as well as the forename.
Mr, Stana, Anita, Aaron, Cindy, Bobby, Brian, Karel, Kelly, Pavel, Paola, Petra, Dejan, Daryl, David, Diane, Duane, Goran, Laura, Lukã, James, Jason, Stela, Jakub, Susan, Sarah, Sus, Kim, Jan, Jim, Sara, Anna, Anne, Adam, Beth, Beki, Kyle, Petr, Dawn, Gary, Gail, John, Juan, Elsa, Imre, Maria, Marek, Shari, and Josef