Where does “Першотравенськ” come from?

Першотравенськ (Ukrainian) comes from Ukrainian пе́рший, from Polish pierwszy, from Old Polish pierwy, from Proto-Slavic pьrvъ, from Proto-Balto-Slavic pírˀwas, from Proto-Indo-European pr̥h₂wós, from Proto-Indo-European per-, from Proto-Indo-European pr̥tós — passed , crossed.

Ancestry of “Першотравенськ”, step by step

Першотравенськ traces back through two separate lines of ancestry.

via Ukrainian пе́рший

StepLanguageWordMeaning
1Ukrainianпе́ршийfirst
2Polishpierwszyfirst
3Old Polishpierwyfirst
4Proto-Slavicpьrvъfirst
5Proto-Balto-Slavicpírˀwas—
6Proto-Indo-Europeanpr̥h₂wósfirst
7Proto-Indo-Europeanper-before, in front; first; to go through
8Proto-Indo-Europeanpr̥tóspassed , crossed

via Ukrainian травень

StepLanguageWordMeaning
1UkrainianтравеньMay
2Old East SlavicтравьнъMay
3Proto-Slavic-ьnъ-ish, -ic, -al, -ed; From adjectives
Every word from Proto-Indo-European pr̥tós →Every word from Proto-Indo-European per- →Every word from Proto-Indo-European pr̥h₂wós →