Cognomen Jancak (Jancak 
) , worldwide, is a very rare last name. The last name Jancak is habitual in Czechia, where it is a rare surname, Austria, and Germany, where it is an extremely rare surname. Much less frequently, Jancak is the forename as well as the last name.
| VARIANT | COUNTRY |
|---|---|
| Jancak | Germany, Austria, India, Czechia |
| karel jancak CZ (b. 1889) |
|
|
| eva jancak Austrian writer, AT (b. 1953) |
|
Mr, Vitezslav, Günther, and Hildegarde