It's impossible to say who *named* the Sun in the sense of giving it a proper noun. The Sun has been recognized as a celestial body since the dawn of humanity, and different cultures have had their own names for it.

Here's why:

* Ancient Origins: People have observed and worshipped the Sun for thousands of years. Early civilizations, like the Egyptians, Greeks, and Romans, had names for the Sun based on their mythology and understanding of the cosmos.

* No Single Creator: The concept of the Sun and its importance was likely a collective understanding that evolved over time, not the result of a single person giving it a name.

* Evolution of Names: The names for the Sun have evolved over time and varied across cultures. For example, in English, the name "Sun" comes from Old English and Proto-Germanic roots.

Therefore, it's more accurate to say that the name "Sun" evolved from a combination of ancient beliefs, observations, and linguistic changes.