Where does “ว่าความ” come from?

ว่าความ (Thai) comes from Thai ความ, from Proto-Tai ɣwaːmᴬ — matter.

ว่าความ (Thai): to adjudicate a legal matter, as a judge, tribunal, etc

Definitions

  1. to adjudicate a legal matter, as a judge, tribunal, etc

Ancestry of “ว่าความ”, step by step

ว่าความ traces back through two separate lines of ancestry.

via Thai ความ

StepLanguageWordMeaning
1Thaiความaffair; matter; content; essence; subject;...
2Proto-Taiɣwaːmᴬmatter

via Thai ว่า

StepLanguageWordMeaning
1Thaiว่าto say, to speak, to tell; to utter, to...
2Middle Chinese
Every word from Proto-Tai ɣwaːmᴬEvery word from Thai ความ
ว่าความ — Etymology, Origin & Word History | Etymology Explorer