|Easton's Bible Dictionary|
(Deuteronomy 1:1, R.V.; marg., "some ancient versions have the Red Sea, " as in the A.V.). Some identify it with Suphah (Numbers 21:14, marg., A.V.) as probably the name of a place. Others identify it with es-Sufah = Maaleh-acrabbim (Joshua 15:3), and others again with Zuph (1 Samuel 9:5). It is most probable, however, that, in accordance with the ancient versions, this word is to be regarded as simply an abbreviation of Yam-suph, i.e., the "Red Sea."
Int. Standard Bible Encyclopedia
soof (cuph; plesion tes eruthras (thalasses); the King James Version Red Sea): As the verse stands, the place where Moses addressed the children of Israel is indicated as "beyond the Jordan in the wilderness, in the Arabah over against Suph" (Deuteronomy 1:1). the King James Version, following Septuagint, takes the name as a contraction of yam cuph (see RED SEA). The abbreviation is not found elsewhere. The name of the sea was not derived from that of a city; so we need not look in that direction. Knobel suggested Naqb es-Safa, a pass about 25 miles West-Southwest of the Dead Sea. But it is "unsuitably situated; nor does the name agree phonetically (for... agrees with..., not with...)" (Driver, "Deuteronomy," ICC, 4). No identification is possible.
Suph (9 Occurrences)
Deuteronomy 1:1 These are the words which Moses spoke to all Israel beyond the Jordan in the wilderness, in the Arabah over against Suph, between Paran, and Tophel, and Laban, and Hazeroth, and Dizahab. (WEB JPS ASV BBE DBY YLT NAS RSV NIV)
1 Kings 9:26 And a navy hath king Solomon made in Ezion-Geber, that is beside Eloth, on the edge of the Sea of Suph, in the land of Edom. (YLT)
Nehemiah 9:9 and dost see the affliction of our fathers in Egypt, and their cry hast heard by the sea of Suph, (YLT)
Psalms 106:7 Our fathers in Egypt, Have not considered wisely Thy wonders, They have not remembered The abundance of Thy kind acts, And provoke by the sea, at the sea of Suph. (YLT)
Psalms 106:9 And rebuketh the sea of Suph, and it is dried up, And causeth them to go Through depths as a wilderness. (YLT)
Psalms 106:22 Of wonderful things in the land of Ham, Of fearful things by the sea of Suph. (YLT)
Psalms 136:13 To Him cutting the sea of Suph into parts, For to the age 'is' His kindness, (YLT)
Psalms 136:15 And shook out Pharaoh and his force in the sea of Suph, For to the age 'is' His kindness. (YLT)
Jeremiah 49:21 From the noise of their fall hath the earth shaken, The cry -- at the sea of Suph is its voice heard. (YLT)