This is the 6656th most frequent Turkish word.
ağaoğlu
"Ağaoğlu" is a Turkish surname meaning "son of the agha" (chief or lord).
In this sentence, 'Ağaoğlu' is used as a proper noun, likely referring to the surname of a person, such as an author.
Ağaoğlu'nun son kitabını okudum.
I read Ağaoğlu's latest book.
Here, 'Ağaoğlu' refers to a corporate name, specifically a construction company known in Turkey.
Mahallenin yeni apartmanı Ağaoğlu şirketi tarafından yapıldı.
The new apartment in the neighborhood was built by the Ağaoğlu company.
In this context, 'ağaoğlu' is used as a traditional term, with 'ağa' historically meaning a local leader or elder, and '-oğlu' indicating 'son of', together referring to the 'son of the ağa'.