Where does “Casnewydd” come from?

Casnewydd (Welsh) comes from Welsh cas, from English Case, from German Käse, from Middle High German kæse, from Old High German kāsi, from Proto-West Germanic kāsī, from Proto-Germanic kāsijaz, from Latin cāseus — to ferment, become sour; to boil.

Ancestry of “Casnewydd”, step by step

Casnewydd traces back through two separate lines of ancestry.

via Welsh cas

StepLanguageWordMeaning
1Welshcashateful, nasty; unpleasant, difficult; averse to
2EnglishCaseabstract feature of a noun phrase that determines...
3GermanKäsecheese; nonsense
4Middle High Germankæsecheese
5Old High Germankāsicheese
6Proto-West Germanickāsīcheese
7Proto-Germanickāsijazcheese
8Latincāseuscheese
9Proto-Indo-Europeankwat-to ferment, become sour; to boil

via Welsh newydd

StepLanguageWordMeaning
1Welshnewyddnew; news; just
2Proto-Brythonicnewɨð
3Proto-Celticnouyosnew
4Proto-Indo-EuropeannéwyosAlternative form of *néwos; new
5Proto-Indo-Europeannéwosnew
6Proto-Indo-Europeannew-new; to nod, assent to
Every word from Proto-Indo-European kwat-Every word from Latin cāseusEvery word from Proto-Germanic kāsijaz