From Middle Chinese 豆 (MC duwH, “bean”). Cognate with Thai ถั่ว (tùua), Northern Thai ᨳ᩠ᩅᩫ᩵, Khün ᨳ᩠ᩅᩫ᩵, Lao ຖົ່ວ (thūa), Lü ᦷᦏᧈ (ṫho¹), Tai Dam ꪖ꪿ꪺ, Shan ထူဝ်ႇ (thò).
ᥗᥨᥱ (thǒ) (1963 orthography ᥗᥨ̌)