I do not agree with the answers above (about dyed brunettes and poorly expressed). I am a brunette and I have a huge number of freckles not only on my face, but even on my shoulders, and they are quite bright and noticeable).
According to the Internet, freckles appear more pronounced in people with light and red hair, but this does not mean that people with a different hair color cannot have freckles, they are simply less pronounced. The very color of freckles depends only on the Sun, nothing more. At the genetic level, only their quantity is determined, but not the presence and color.
Only dyed brunettes have it. But in fact, I think everyone has freckles, because the sun leaves traces. Freckles are cool!