From Proto-Tai *ʰwaːkᴰ (“to entrust”). Cognate with Lao ຝາກ (fāk), Lü ᦚᦱᧅ (ḟaak), Shan ၽၢၵ်ႇ (phàak) or ၾၢၵ်ႇ (fàak), Ahom 𑜇𑜞𑜀𑜫 (phrak).
ᥜᥣᥐᥱ (fǎak) (1963 orthography ᥜᥣᥐ̌)