Where does “ynysoedd” come from?

ynysoedd (Welsh) comes from Welsh ynys, from Old Welsh inis, from Proto-Brythonic ɨnɨs, from Proto-Celtic enistī, from Proto-Indo-European h₁eni-sth₂-ih₂, from Proto-Indo-European steh₂- — to stand.

Ancestry of “ynysoedd”, step by step

StepLanguageWordMeaning
1Welshynysisland; piece of land, realm, territory
2Old Welshinis—
3Proto-Brythonicɨnɨsisland
4Proto-Celticenistīisland
5Proto-Indo-Europeanh₁eni-sth₂-ih₂—
6Proto-Indo-Europeansteh₂-to stand
Every word from Proto-Indo-European steh₂- →Every word from Proto-Indo-European h₁eni-sth₂-ih₂ →Every word from Proto-Celtic enistī →