That may have actually been (slightly?) intentional. When talking about our Sun in the greater context of stars, I've often seen it referred to as "Sol". The best immediate example I have are games like Stellaris or Elite: Dangerous which refer to our home system as the "Sol System" and our star as "Sol", but I recall hearing it in non-sci-fi contexts as well.

I'm not really sure how the etymology works out on all of that, though.