system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Who was the person responsible for naming our planet "Earth", Why?
gpt
There wasn't so much a person as just a group.  The word earth evolved from the german word erda, which was used to describe the ground/dirt.  In the middle ages people began using it to describe the globe by saying the earth.  Now it is Earth.