From Proto-Tai *rɯːwᶜ (“to know”). Cognate with Thai รู้ (rúu), Northern Thai ᩁᩪ᩶, Isan ฮู้, Lao ຮູ້ (hū), Lü ᦣᦴᧉ (huu²), Tai Dam ꪭꪴ꫁, Ahom 𑜍𑜥 (rū) or 𑜍𑜤𑜈𑜫 (ruw), Zhuang rox, Saek รอ.
ႁူႉ • (hṵ̂u) (abstract noun လွင်ႈႁူႉ)