From Proto-Tai *ʰwɯəꟲ (“cloud”). Cognate with Thai ฝ้า (fâa).
fwj (Sawndip forms 𬽀 or 𰌟 or ⿱勿云 or ⿰弗云 or ⿱雨发 or 𬽂 or ⿱府雲 or ⿰丰雲 or 𬽁 or ⿰子雲 or ⿱符云 or 𮦔 or ⿰云發, 1957–1982 spelling fɯз)