The Nuttall Encyclopedia
A sacred well in Mecca, and all built round along with the Caaba (q. v .); has its name from the bubbling sound of the waters; the Moslems think it the Well which Hagar found with her little Ishmael in the wilderness when he was dying of thirst.
Wood, James, ed. Entry for 'Zem-Zem'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/z/zem-zem.html. Frederick Warne & Co Ltd. London. 1900.