* Brown is the most common natural hair color: Globally, the majority of people have brown hair.
* Blonde is highly popular in many regions: In some parts of the world, particularly in Europe and North America, blonde hair is highly sought after and is often seen as a desirable trait.
* Black hair is also very common: In many parts of Asia and Africa, black hair is the dominant hair color.
* Dyed hair is becoming increasingly common: With the rise of hair dye technology and a greater acceptance of self-expression, dyed hair in various colors is gaining popularity.
It's important to remember that popularity can change over time and varies depending on location and cultural trends. Ultimately, the "most popular" hair color is a subjective question with no single answer.