Where does “afondeithiau” come from?

afondeithiau (Welsh) comes from Welsh afondaith, from Welsh afon, from French aphone, from Ancient Greek ἄφωνος, from Ancient Greek -φωνος, from Ancient Greek φωνή, from Proto-Hellenic pʰōnā́, from Proto-Indo-European bʰoh₂-néh₂.

Ancestry of “afondeithiau”, step by step

afondeithiau traces back through two separate lines of ancestry.

via Welsh afondaith

StepLanguageWordMeaning
1Welshafondaithriver voyage or cruise
2Welshafonriver
3Frenchaphonevoiceless, aphonic
4Ancient Greekἄφωνοςvoiceless, dumb; unable to speak; intestate
5Ancient Greek-φωνοςsounding
6Ancient Greekφωνήsound; Usually of the human voice: voice, cry,...
7Proto-Hellenicpʰōnā́
8Proto-Indo-Europeanbʰoh₂-néh₂
9Proto-Indo-Europeanbʰeh₂-to shine, glow light; to speak, say
10Proto-Indo-Europeanbʰeh₂-s-ri-

via Welsh Iau

StepLanguageWordMeaning
1WelshIauJupiter, Thursday
2Middle Welshieu
3Brythonic*Yow
4LatinIovem
5Proto-Indo-Europeandyew-to be bright; sky, heaven
Every word from Proto-Indo-European bʰeh₂-s-ri-Every word from Proto-Indo-European bʰeh₂-Every word from Proto-Indo-European bʰoh₂-néh₂