Where does “gościni” come from?

gościni (Polish) comes from Polish gość, from Proto-Slavic gȍstь, from Proto-Balto-Slavic gastis, from Proto-Indo-European gʰóstis, from Proto-Indo-European -tis — Derives abstract/action nouns from verb roots.

Ancestry of “gościni”, step by step

StepLanguageWordMeaning
1Polishgośćguest; guy, fellow
2Proto-Slavicgȍstьguest
3Proto-Balto-Slavicgastisguest
4Proto-Indo-Europeangʰóstisstranger, host
5Proto-Indo-European-tisDerives abstract/action nouns from verb roots
Every word from Proto-Indo-European -tis →Every word from Proto-Indo-European gʰóstis →Every word from Proto-Balto-Slavic gastis →