From Proto-Kra, from Proto-Kra-Dai. Cognate with Maonan tu¹, Proto-Be *katᴰ² (whence kat⁷ ~ kɑt⁷ in modern lects) and Proto-Hlai *Cuʈʂʰuː (whence ʈʂʰow¹ ~ fow¹ in modern lects) and possibly Thai เหา (hǎo).
ðu³³
