From Proto-Tai *pɯwᴮ (“paternal grandfather”). Cognate with Thai ปู่ (bpùu), Lao ປູ່ (pū), Lü ᦔᦴᧈ (ṗuu¹), Shan ပူႇ (pùu), Ahom 𑜆𑜥 (pū).
baus