A tautological name has two parts that are redundant, or synonymous. Tautological place names usually come about when more than one language goes into the name. Like Sahara desert. The name comes from çaḥrā, the Arabic word for deserts. Or El Camino Way, a street in Palo Alto, California. It means The Way Way. And if you drive down it in your Chevy El Camino you will be driving your way down The Way Way in The Way.