Where does “cerddi” come from?

cerddi (Welsh) comes from Welsh i, from Middle Welsh y, from Old Welsh ir, from Proto-Celtic sindos, from Proto-Indo-European sḗm, from Proto-Indo-European sem- — together, one.

Ancestry of “cerddi”, step by step

cerddi traces back through two separate lines of ancestry.

via Welsh i

StepLanguageWordMeaning
1WelshiI, me; to, for; that
2Middle Welshyhis, its with reference to a masculine noun; triggers soft mutation of following consonant
3Old Welshirthe
4Proto-Celticsindosthis
5Proto-Indo-Europeansḗmone
6Proto-Indo-Europeansem-together, one

via Welsh cerdd

StepLanguageWordMeaning
1Welshcerddpoem; poetry; music
Every word from Proto-Indo-European sem-Every word from Proto-Indo-European sḗmEvery word from Proto-Celtic sindos