From Proto-Tai *qawᴬ (“horn”). Cognate to Thai เขา (kǎo), Northern Thai ᨡᩮᩢᩣ, Lao ເຂົາ (khao), Lü ᦃᧁ (ẋaw), Shan ၶဝ် (khǎo), Ahom 𑜁𑜧 (khaw) or 𑜁𑜨𑜧 (khow).
gaeu (1957–1982 spelling gəu)