Where does “唄” come from?

唄 (Chinese) comes from Sanskrit भाषते, from Proto-Indo-European bʰeh₂-, from Proto-Indo-European bʰeh₂-s-ri-.

Ancestry of “唄”, step by step

StepLanguageWordMeaning
1Sanskritभाषतेto speak, say, talk; to announce
2Proto-Indo-Europeanbʰeh₂-to shine, glow light; to speak, say
3Proto-Indo-Europeanbʰeh₂-s-ri-—
Every word from Proto-Indo-European bʰeh₂-s-ri- →Every word from Proto-Indo-European bʰeh₂- →Every word from Sanskrit भाषते →