From Proto-Tai *pajᴬ (“to go”). Cognate with Northern Thai ᨻᩱ (pai), Khün ᨻᩱ (pai), Lao ໄປ (pai), Lü ᦺᦔ (ṗay) and ᦺᦗ (pay), Tai Dam ꪼꪜ, Shan ပႆ (pǎi), Aiton ပႝ (pay), Phake ပႝ (pay), Nùng páy, Zhuang bae, Bouyei bail, Tày pây, Thai ไป (bpai).
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