The Earth is called "Earth" because it's the name given to our planet by Anglo-Saxons, who were among the earliest inhabitants of England. They used the word "eorðe" or "erda" which simply meant "ground" or "soil."

Here's why this name stuck:

* It's descriptive: The name reflects the most obvious feature of our planet – the solid ground we stand on.

* It's ancient: The name has been used for centuries, becoming a part of our collective identity.

* It's universal: While other cultures have their own names for the planet, the word "Earth" has become the standard international term.

It's worth noting that other cultures have different names for the planet. For example:

* Latin: Terra

* Greek: Gaia

* Japanese: Chikyū

However, the Anglo-Saxon name "Earth" has become the most widely recognized and used name for our planet.