From Proto-Tai *kɤwᶜ (“nine”), from Middle Chinese 九 (MC kɨuX, “nine”), from Old Chinese 九 (OC *kuʔ), from Proto-Sino-Tibetan *d/s-kəw. Cognate with Thai เก้า (gâao), Northern Thai ᨠᩮᩢ᩶ᩣ, Lao ເກົ້າ (kao), Lü ᦂᧁᧉ (k̇aw2), Tai Dam ꪹꪀ꫁ꪱ, Shan ၵဝ်ႈ (kāw), Ahom 𑜀𑜧 (kaw), Zhuang gouj.
กู̂ (transliteration needed)