Where does “ความขำ” come from?

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

Ancestry of “ความขำ”, step by step

ความขำ traces back through two separate lines of ancestry.

via Thai ความ

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

via Thai ขำ

StepLanguageWordMeaning
1Thaiขำprivate; secret; funny; hilarious; laughable;...
Every word from Proto-Tai ɣwaːmᴬEvery word from Thai ความ