This is the 2547th most frequent Japanese word.
大久保
Ōkubo: A Japanese surname and place name.
In this sentence, '大久保' is used as a proper noun referring to a geographical location in Japan.
大久保は日本の地名の一つです。
Ōkubo is one of the place names in Japan.
Here, '大久保' serves as a Japanese surname, indicating family lineage.
彼の名字は大久保です。
His last name is Ōkubo.
In this example, '大久保' is part of the name of a specific train station, showing location in a travel context.