What is the ruling on one who wishes to embrace Islam and believes in the existence of a Messenger for humanity without knowing his name; does he enter Islam, or is it a condition to know the Messenger's name, and is a kunya (agnomen) or another name, such as "Ahmad" or "Al-Mahi," acceptable instead of "Muhammad"?

A person does not enter Islam except by uttering the two testimonies (Shahadatayn) if they are able to, along with acknowledging their meaning. If they are unable to speak, like a mute person, their entry into Islam is by writing or by a sign indicating consent and acceptance. The name of the Prophet Muhammad, peace and blessings be upon him, must be mentioned in the testimony, and all his names and kunyas are equal in this regard. Whoever believes in a messenger sent by Allah to humanity and does not know his name, but testifies to that with their tongue, then they are a Muslim. If a disbeliever says something that indicates their entry into Islam and their belief in Prophet Muhammad, peace and blessings be upon him, it is accepted from them and they are judged to be Muslim, and then they are taught the two testimonies in their complete form. Moreover, even if a disbeliever limits themselves to saying: "There is no god but Allah," they are judged to be Muslim, and then they are taught and commanded to say the second testimony.