From Proto-Tai *χawᶜ (“to enter”). Cognate with Thai เข้า (kâo), Lao ເຂົ້າ (khao), Lü ᦃᧁᧉ (ẋaw2), Tai Dam ꪹꪄ꫁ꪱ, Shan ၶဝ်ႈ (khāw), Ahom 𑜁𑜧 (khaw), 𑜁𑜨𑜧 (khow), 𑜁𑜧𑜈𑜫 (khaww) or 𑜁𑜨𑜧𑜈𑜫 (khoww), Zhuang haeuj.
ᥑᥝᥲ (xaw4) (old orthography ᥑᥝˋ)