Why I'm Called - Jupiter

I am Jupiter.

I am the fifth planet from the Sun.

My name was given in antiquity (observed by Babylonians ~2000 BCE).

I was named by Ancient Babylonians (as Marduk), Greeks (as Zeus), Romans (as Iuppiter).

My name came about because as the largest and brightest after Venus, I was linked to the king of gods; Greeks called me Phaethon ("shining one").

My name means Roman king of the gods (equivalent to Greek Zeus).

An interesting fact is Jupiter's immense size made it a fitting namesake for the chief deity; its moons were named after Zeus's lovers, continuing the mythological theme.