Southern Thai ตู

← Lao ປະຕູ (cognate)

← Northern Thai ᨲᩪ (cognate)

← Northern Thai ᨸᨲᩪ (mention)

← Bouyei dul (cognate)

← Shan တူ (cognate)

← Proto-Tai *tuːᴬ (inherited)

← Thai ตู (cognate)

← Thai ประตู (mention)

← Zhuang dou (cognate)

← Zhuang du (mention)

→ Shan တူ (cognate)

→ Thai ตู (cognate)

→ Thai ประตู (cognate)