This is the 2579th most frequent Japanese word.
山下
"Yamashita" is a Japanese surname meaning "below the mountain" or "foot of the mountain."
In this sentence, 山下 (Yamashita) is used as a surname of a specific individual, with the polite honorific さん attached to denote respect.
山下さんは親切な方ですね。
Mr. Yamashita is a kind person.
Here, 山下 (Yamashita) refers to the area below the mountain, employed as a geographical term.
山下の公園で散歩をしました。
I took a walk in the park below the mountain.
In this context, 山下 (Yamashita) describes the foothills of the mountain, indicating the location where someone began climbing.