This is the 7213th most frequent Japanese word.
上原
"上原" (Uehara) is a Japanese surname meaning "upper plain" or "top field."
In this sentence, 上原 is used as a family name referring to a specific person, denoted with the honorific さん.
上原さんは昨日、学校に来ました。
Mr. Uehara came to school yesterday.
Here, 上原 refers to a place name, specifically a town, indicating a geographic context.
上原は静かな町として知られています。
Uehara is known as a quiet town.
In this case, 上原 functions as part of a proper noun for a specific station's name.