From Sanskrit अष्ठीवत् (aṣṭhīvat). Cognate with ognate with Bengali হাঁটু (hãṭu), Sylheti ꠀꠑꠥ (aṭú), Assamese আঁঠু (ãthu).
ଆଣ୍ଠୁ (āṇṭhu)