tāhau - your, ā category possession, singular (variant of tāu)
Tāhau (i), tātāhau, n. Leg, shin. Tāhau o te ringa, forearm.
Williams Dictionary
Tāhau (ii) = tāu, pron. Thy. Maui e, takua atu, he atua tahau (Tr. vii, 39).