The original namer of "World" is lost to history.
Like the names of many celestial bodies, the term "World" has Anglo-Saxon origins, dating back centuries. The exact individual or group responsible for its initial usage to describe our planet is unknown. The term evolved organically over time as language developed and cultures interacted. The term "world" is deeply embedded in human history and predates recorded attribution.
Therefore, pinpointing a specific person who "named World World" is impossible. Its origins are rooted in ancient language and usage, developed over generations.
