From Proto-Tai *soːŋᴬ, from Middle Chinese 雙 (MC ʃˠʌŋ, “two”). Cognate with Thai สอง (sɔ̌ɔng), Northern Thai ᩈᩬᨦ, Lao ສອງ (sǭng), Lü ᦉᦸᧂ (ṡoang), Tai Dam ꪎꪮꪉ, Shan သွင် (sǒang), Ahom 𑜏𑜨𑜂𑜫 (song), Zhuang song.
ᥔᥩᥒᥴ (soang1) (old orthography ᥔᥩᥒˊ)