Family name Koikas (Koikas 
) , globally, is a rare surname. The cognomen Koikas is characteristic of Greece, where it is quite a rare surname, Australia, where it is a very rare surname, and the United States, where it is an extremely rare surname.
| VARIANT | COUNTRY |
|---|---|
| Koikas | Canada, Australia, United States, Greece |
Tom, Fannie, Yannis, Sophiah, Klearchos, Dimitris, Georgios, Nikolaos, Dimitrios, Theofania, Evangelos, Vasileios, Athanasios, Konstantin, Konstandia, Panagiotis, Thomas, Constantine, Loukas, Ashley, Ted, Pete, Dino, John, Thia, Nick, Maria, Chris, Peter, Peggy, Robin, Louis, Takis, Nikki, Stella, George, and Konstantinos