For the record, the Sun's proper name is Sol. The fact that we don't refer to it as such is due to the fact that it wasn't named by humanity as a somewhat space-fairing civilisation until recently. If you were to look at a proper map of the local cluster, the Sun would be designated as Sol for the purpose of navigation and differentiation from other stars, which are classified as "Suns" if they have planets orbiting them. It's just like the simple fact that the Moon has a proper astronomical name: Luna. We simply refer to it as "The Moon" because we were unaware that other planets had moons for thousands of years.
