Bede

But I gathered them at the river that flows to Ahava. I do not remember reading this name of the place anywhere else. However, when it is later written, And I proclaimed there a fast by the river Ahava; and after some further writing, We set out from the river Ahava on the twelfth day of the first month; it seems probable that Ahava is both a river and that another river flows into it, at the confluence of which Ezra gathered those who went up with him. Moreover, Josephus substitutes the Euphrates for this name. …

Commentary on Ezra and Nehemiah ↗