Where does “Sostak” come from?

Sostak (English) comes from Belarusian Шоста́к, from Belarusian шосты, from Proto-Slavic šestъ, from Proto-Balto-Slavic śeśtas, from Proto-Indo-European sweḱstós — sixth.

Ancestry of “Sostak”, step by step

Sostak traces back through two separate lines of ancestry.

via Belarusian Шоста́к

StepLanguageWordMeaning
1BelarusianШоста́к—
2Belarusianшостыsixth
3Proto-Slavicšestъsixth
4Proto-Balto-Slavicśeśtas—
5Proto-Indo-Europeansweḱstóssixth

via Ukrainian Шостак

StepLanguageWordMeaning
1UkrainianШостак—
2Ukrainianшостийsixth
Every word from Proto-Indo-European sweḱstós →Every word from Proto-Balto-Slavic śeśtas →Every word from Proto-Slavic šestъ →