The word "girl" is called "girl" because it evolved from older words. Specifically, the word "girl" originated from the Anglo-Saxon word "gerle" (also spelled girle or gurle) between 1250 and 1300 CE.
Here's a breakdown of the etymology:
- Origin: Anglo-Saxon "gerle" (or girle, gurle)
The Anglo-Saxon word "gerela" meaning dress or clothing item also seems to have been used as a metonym in some sense.