Is it appropriate to use the term (Abdullah) for both the believer and the disbeliever?

Question:
I say, Honorable Shaykh, is it appropriate to use, or to apply, the term Abdullah to both the believer and the disbeliever, meaning that the disbeliever and the Muslim are addressed by this term equally?

Answer:
No, the disbeliever is not addressed by saying "O Abdullah," because this confers honor upon him. Although he is a servant of Allah in the sense of the general servitude, you do not address him by this name, "O Abdullah." You say, "O human," "O Adamite," or "O..."