This is the 7952nd most frequent Japanese word.
外山
"外山" (Toyama) is a Japanese surname or place name meaning "outer mountain."
In this sentence, 外山 might refer to a specific place, such as a mountain named Toyama.
私は外山でピクニックをしました。
I had a picnic at Toyama (a location, potentially a mountain or area).
Here, 外山 (Toyama) refers to a surname, commonly used in Japanese names.
外山さんは私の友達です。
Mr./Ms. Toyama is my friend.
This illustrates the use of 外山 as a proper noun and emphasizes the commonality of the name Toyama.