Ephah was the name of several persons and also of a grain measure. Persons called Ephah included a son of Midian, a concubine of Caleb, and a descendant of Judah.
The Ephah descended from Midian is connected with a city and people mentioned by Isaiah. The measure appears in passages concerning grain, commerce, and honest weights.
The ephah was a measure containing three seahs or ten omers and was equivalent to the bath for liquids. A “double ephah” contrasted a false measure with a just one.