Easton's Bible Dictionary (1897)
Perhaps another name for Khetam, or “fortress,” on the Shur or great wall of Egypt, which extended from the Mediterranean to the Gulf of Suez. Here the Israelites made their third encampment (Ex. 13:20; Num. 33:6). The camp was probably a little to the west of the modern town of Ismailia. Here the Israelites were commanded to change their route (Ex. 14:2), and “turn” towards the south, and encamp before Pi-hahiroth.
Smith's Bible Dictionary (1863)
” (Exodus 13:20; Numbers 33:6,7) Etham may be placed where the cultivable land ceases, near the Seba Biar or Seven Wells, about three miles from the western side of the ancient head of the gulf.
Hastings' Dictionary of the Bible (1898) & Schaff's Bible Dictionary
" Ex 13:20; Num 33:6-7. Canon Cook would identify it with Pithom or ancient Hierapolis; others with Seba Beer, "seven wells," about 3 miles west of the Red Sea; Trumbull, with a "wall" from the Red to the Great Sea.
Hitchcock's Bible Names (1869)
their strength; their sign