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 | Brazil, Italy, Poland, France, United States |
| Flank | Poland, Sweden, France, United States, South Africa |
| Flanco | Philippines, Brazil, United States, Argentina, Romania |
| Flanko | Brazil, Italy, Spain |