Where does “Cojoiu” come from?

Cojoiu (Romanian) comes from Romanian coajă, from Proto-Slavic koža, from Proto-Slavic -ja, from Proto-Indo-European -yeh₂.

Ancestry of “Cojoiu”, step by step

StepLanguageWordMeaning
1Romaniancoajălayer; peel (of fruit), rind, crust (of bread), shell (of nuts), or bark (of trees)
2Proto-Slavickožaskin; leather
3Proto-Slavic-jaSuffix creating feminine action nouns, usually...
4Proto-Indo-European-yeh₂—
Every word from Proto-Indo-European -yeh₂ →Every word from Proto-Slavic -ja →Every word from Proto-Slavic koža →