Where does “bratuleniek” come from?

bratuleniek (Polish) comes from Polish bratul, from Polish brat, from Old Polish brat, from Proto-Slavic bratrъ, from Proto-Balto-Slavic brā́ˀtē, from Proto-Indo-European bʰréh₂tēr — brother.

Ancestry of “bratuleniek”, step by step

StepLanguageWordMeaning
1Polishbratul—
2Polishbratbrother
3Old Polishbratbrother
4Proto-Slavicbratrъbrother
5Proto-Balto-Slavicbrā́ˀtēbrother
6Proto-Indo-Europeanbʰréh₂tērbrother
Every word from Proto-Indo-European bʰréh₂tēr →Every word from Proto-Balto-Slavic brā́ˀtē →Every word from Proto-Slavic bratrъ →