Elysium Mons (Mars)

This feature is named after an earlier feature.

Elysium Mons is a volcano on Mars located in the volcanic province Elysium, in the volcanic province Elysium,. It stands about 13.9 km above the Martian datum. Its diameter is about 240 km across. It is flanked by the smaller volcanoes Hecates Tholus to the northeast, and Albor Tholus to the southeast. (wikipedia entry)

A mons is a mountain. On Mars they are named after the nearest named albedo feature on the Schiaparelli or Antoniadi maps.