This is the 8377th most frequent Japanese word.
忠雄
A Japanese male given name, typically read as "Tadao" or "Chūyū," meaning "loyal hero."
Here, '忠雄' is used as a proper noun to refer to a person's name.
忠雄は優れたリーダーである。
Chūo is an excellent leader.
In this sentence, '忠雄' is used with the honorific 'さん', which is typical when addressing someone respectfully.
忠雄さんはどちらにいらっしゃいますか？
Where is Mr. Chūo?
Here, '忠雄' is used in the context of identifying a specific person being referred to as a friend.