As of 2021, the most famous (and valuable) brand in the world is Apple.
Determining the most famous brand is tricky because "famous" can be measured in different ways: brand value, recognition, cultural impact, etc. However, consistently, Apple is often considered the most famous brand globally.
Here's why:
While other brands like Coca-Cola, Microsoft, Google, and Amazon are also extremely famous and often contend for the top spot depending on the ranking methodology, Apple's consistent presence at the top, widespread recognition, and significant cultural impact often lead it to be considered the most famous brand in the world.