You're thinking of Helium, which is named after the Greek word for the sun, "Helios."

While there are no elements directly named after the other planets, here's a bit more about Helium's connection to the sun:

* Discovery: Helium was first discovered in the sun's spectrum in 1868 by French astronomer Pierre Janssen. It was only later isolated on Earth.

* Solar Origin: Helium is a product of nuclear fusion within stars, including our sun. This process is how stars generate energy.

So, while other planets haven't directly inspired element names, the sun's influence on science, including the discovery of Helium, is significant.