From Proto-Tai *ruːᴬ (“hole”). Cognate with Thai รู (ruu), Northern Thai ᩁᩪ, Lü ᦣᦴ (huu), Tai Dam ꪭꪴ, Shan ႁူး (húu), Ahom 𑜍𑜥 (rū).
ຮູ • (hu)