Where does “fejniük” come from?

fejniük (Hungarian) comes from Hungarian -niük, from Hungarian -ük, from Proto-Germanic -ukaz — Forms diminutive nouns.

Ancestry of “fejniük”, step by step

StepLanguageWordMeaning
1Hungarian-niükUsed to form the third-person plural of a...
2Hungarian-üktheir
3Proto-Germanic-ukazForms diminutive nouns
Every word from Proto-Germanic -ukaz →Every word from Hungarian -ük →Every word from Hungarian -niük →