A popular girl color is pink. This association is deeply ingrained in Western culture, with girls in the US and Great Britain showing a strong preference for this color from a young age.
While other colors might be popular among girls in different cultures, like purple in Japan, pink remains a dominant choice in many Western societies. This association likely stems from historical and societal influences, as pink was once considered a more masculine color.
However, it's important to remember that individual preferences vary widely, and there are no strict rules about what colors people should or shouldn't like.