This is the 1415th most frequent Turkish word.
abdullah
"Abdullah" is a male given name meaning "Servant of Allah" in Turkish and Arabic.
Here 'Abdullah' is used as a proper noun, specifically a personal name, to address a person directly.
Abdullah, bugün çok iyi bir iş çıkardın.
Abdullah, you did a great job today.
In this sentence, 'Abdullah' is again used as a proper noun, showing ownership or association with him through the genitive case suffix ('ın').
Abdullah'ın bu konuda ne düşündüğünü merak ediyorum.
I wonder what Abdullah thinks about this matter.
Here, 'Abdullah' is used as a proper noun, presented as the name of someone, and denotes identification.