This is the 7838th most frequent Japanese word.
哲彦
"哲彦" is a Japanese male given name meaning "wise man" or "philosophical gentleman."
Here, '哲彦' is used as a proper noun referring to a person's name.
哲彦は毎朝ジョギングをしています。
Tetsuhiko goes jogging every morning.
In this sentence, '哲彦' refers to the author of the book, utilizing its possessive implication.
哲彦が書いた本はとても面白かったです。
The book Tetsuhiko wrote was very interesting.
Here, '哲彦' is directly identifying a name, making it the subject of the statement.