Family name Koutsoubas (Koutsoubas 
) , globally, is a very rare cognomen. The cognomen Koutsoubas is habitual in Greece, where it is a rare surname, Australia, where it is a very rare surname, and Germany, where it is an extremely rare surname. Measured by absolute frequency, it most frequently occurs in Greece, the United States, and Australia.
| VARIANT | COUNTRY |
|---|---|
| Koutsoubas | Greece, Australia, Germany, Canada, United States |