Where does “Tonypandy” come from?

Tonypandy (Welsh) comes from Welsh y, 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 “Tonypandy”, step by step

Tonypandy traces back through 3 separate lines of ancestry.

via Welsh y

StepLanguageWordMeaning
1Welshythe; that; which, whom
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 tôn

StepLanguageWordMeaning
1Welshtôntone, sound; tune, melody
2Middle Welshtonn
3Proto-Brythonic*tonn
4Proto-Celtictundāwave, billow
5Proto-Indo-European(s)tewd-to push, to hit
6Proto-Indo-Europeanstew-to praise, laud

via Welsh pandy

StepLanguageWordMeaning
1Welshpandyfulling mill
2Welshhouse
3Middle Welshty
4Proto-Brythonictɨɣhouse
5Proto-Celtictegoshouse, dwelling
6Proto-Indo-European(s)teg-to cover; pole, stick, beam
Every word from Proto-Indo-European sem-Every word from Proto-Indo-European sḗmEvery word from Proto-Celtic sindos