Cognomen Blennius (Blenny 
, Blennius 
) , all around the world, is a rare family name. The last name Blennius is habitual in Switzerland, where it is a rare surname, France, and Sweden. Also, Blennius is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Blenny | Dominican Republic, Switzerland, France, Democratic Republic of the Congo, Peru |
| Blennius | Sweden, Spain |