Wagyl Stone is a jasper that reminds me of a topographic map showing the curves and elevation of valleys, which may be where the name comes from. To understand “Wagyl stone,” it helps to start with Wagyl (also spelled Waugal, Waagal, etc.), a figure in Noongar (South-west Australia) Aboriginal mythology:

The Wagyl is the Noongar version of the Rainbow Serpent — a powerful Dreamtime creature associated with water, creation, and the shaping of land. Stories say the Wagyl created the Swan River, Canning River, and many landforms around Perth and southwestern Western Australia.

The serpentine body of the Wagyl is said to have “carved” the landscape — hills, valleys, watercourses, basins, etc.

So when a stone is called a “Wagyl stone,” it likely draws symbolic or cultural inspiration from that myth.