This is the 683rd most frequent Japanese word.
大谷
"大谷" (Ōtani or Ōya) is a Japanese surname meaning "large valley."
In this sentence, '大谷' is used as a person's surname.
大谷さんは野球選手です。
Mr. Otani is a baseball player.
In this sentence, '大谷' represents the name of a high school, suggesting institutional naming usage.
大谷高校はこの地域で有名な学校です。
Otani High School is a renowned school in this area.
Here, '大谷' refers to the name of a geographical feature, a valley.