Where does “四天王天” come from?

四天王天 (Chinese) comes from Sanskrit चतुर्, from Proto-Indo-Aryan ćatwā́ras, from Proto-Indo-Iranian čatwā́ras, from Proto-Indo-European kʷetwóres, from Proto-Indo-European kʷe- — and.

Ancestry of “四天王天”, step by step

四天王天 traces back through two separate lines of ancestry.

via Sanskrit चतुर्

StepLanguageWordMeaning
1Sanskritचतुर्four
2Proto-Indo-Aryanćatwā́ras—
3Proto-Indo-Iraniančatwā́rasfour
4Proto-Indo-Europeankʷetwóresfour
5Proto-Indo-Europeankʷe-and

via Chinese 天

StepLanguageWordMeaning
1Chinese天—
Every word from Proto-Indo-European kʷe- →Every word from Proto-Indo-European kʷetwóres →Every word from Proto-Indo-Iranian čatwā́ras →