🔼The name Suphah in the Bible
It's not clear whether the name Suphah actually exists in the Bible. The authors of the Septuagint didn't think so, and neither did those behind the Vulgate and even the King James, and read for Numbers 21:14, "...What He did in the Red Sea, and in the brooks of Arnon".
Younger translations of the Bible, however, tend to speak of "Waheb in Suphah, and the wadies/ravines of Arnon". For a closer look at this conundrum, see our article on the name Waheb.
🔼Etymology of the name Suphah
The name Suphah is identical to the feminine noun סופה (supa), meaning storm-wind, but would also be identical to a feminine form of the masculine noun סוף (sup), meaning reeds:
None of the sources we commonly consult translates the name Suphah, although BDB Theological Dictionary does acknowledge it as a location other than the Red Sea (or rather the Sea of Reeds) and confirms that it is identical to the noun סופה (supa), meaning Storm-wind.
If this name was meant as a feminine version of the noun סוף (sup), it would probably mean something like Place Of Reeds, which in turn could be construed as a technical term for a place of learning; a library full of papyri.