Bringer of Water
You may laugh and think the tribe that named this god is stupid, but you didn't look deep enough. You forget that geothermal energy drives water from deep near the Earth's core towards the surface as it boils. The volcanoes that turn into mountains trap clouds and produce rain. Oh, and besides bringing water, he also can control the tidal flow of magma and control storms through the friction of volcanic soot, bringing lightning to the earth.... so go ahead, tell him his name is wrong.