Why is the Ring of Fire a particularly appropriate name for the zone around the rim of the Pacifc Ocean?

The whole reason the Ring of Fire is called that name is because of the volcanoes.

Volcanoes form when magma under the earth reaches the outer layer of the earth and pushes up the ground to form a volcano. This process happened at TON in the area of the Ring of fire, so that's why we gave it that name.

Or, another theory is that when the plate boundaries of the crust diverge or converge, it can fracture the crust allowing magma to reach the surface. Volcanoes form along diverging plate boundaries like, mid ocean ridges and along converging plate boundaries where subduction takes place.