All around the world, Mastnak (Mastnak 
) is an extremely rare unknown gender first name. Much more prevalently, Mastnak is the last name as well as the forename.
| VARIANT | COUNTRY |
|---|---|
| Mastnak | Austria, Germany, France, Argentina, Slovenia |
| grega mastnak Grega Mastnak * 1969 , painter, draghtsman sex: male notes: Slovinský malíř a kreslíř, SI (b. 1969) |
|
Mr, Matic, Mojca, Mitja, Sarah, Simon, Boris, Borut, Bruno, Blaž, Marko, Karla, Peter, Denis, Dejan, Dario, Darko, Duska, Laura, Jože, Julia, Pablo, Maria, Žan, Zala, Ms, Ana, Kim, Rok, Eva, Maja, Miha, Susi, Anne, Rose, Rene, Lara, Luka, Juan, Jure, Tina, Nina, Neja, Nejc, Ivan, Igor, Julie, and Jörg