This is the 965th most frequent Japanese word.
埼玉
Saitama: A prefecture in Japan located north of Tokyo.
Here, '埼玉' indicates the proper noun, referring to the region's name.
埼玉は日本の関東地方にあります。
Saitama is located in the Kanto region of Japan.
In this sentence, '埼玉' is used to denote the origin or hometown.
彼は埼玉出身です。
He is from Saitama.
'埼玉' functions as a possessive noun, associating it with its specialties or features.