This is the 534th most frequent Japanese word.
千葉
Chiba (a prefecture in Japan or its capital city).
Here, '千葉' (Chiba) is used as a proper noun, representing the geographical location (the city or prefecture of Chiba).
千葉は美しい風景で知られています。
Chiba is known for its beautiful scenery.
In this sentence, '千葉' (Chiba) functions as a family name.
彼の名前は千葉太郎です。
His name is Taro Chiba.
Here, '千葉' is used to signify the region where several traditional place names are located.