Cognomen Flanko (Flanc 
, Flank 
, Flanco 
) , in all the world, is quite a rare family name. The surname Flanko is habitual in Sweden, where it is a rare surname, Poland, and Philippines. Not in comparison with a country's population, it most frequently occurs in Philippines, the United States, and Poland. Also, Flanko is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Flanc | United States, France, Poland, Italy, Brazil |
| Flank | United States, France, South Africa, Sweden, Poland |
| Flanco | Argentina, United States, Romania, Philippines, Brazil |
| Flanko | Spain, Italy, Brazil |