Where does “Czechosłowacja” come from?

Czechosłowacja (Polish) comes from Polish Czechy, from Polish -y, from Old Polish -y, from Proto-Slavic jь, from Proto-Balto-Slavic iś, from Old Polish ić, from Proto-Slavic jьti, from Proto-Balto-Slavic eitei — to go.

Ancestry of “Czechosłowacja”, step by step

Czechosłowacja traces back through two separate lines of ancestry.

via Polish Czechy

StepLanguageWordMeaning
1PolishCzechy
2Polish-ynominative plural ending of some masculine nouns;...
3Old Polish-yforms adjectives
4Proto-Slavicthis; he
5Proto-Balto-Slavicthis
6Old Polishto go
7Proto-Slavicjьtito go
8Proto-Balto-Slaviceiteito go
9Proto-Indo-Europeanh₁éytito go, to be going
10Proto-Indo-Europeanh₁ey-to go

via Polish Słowacja

StepLanguageWordMeaning
1PolishSłowacja

Words derived from “Czechosłowacja

Every word from Proto-Indo-European h₁ey-Every word from Proto-Indo-European h₁éytiEvery word from Proto-Balto-Slavic eitei