The story of the name
The letters, then the oath
Surah Yasin opens with two letters, and then Allah swears by His own Book: Ya-Sin. By the wise Qur'an — indeed, you are among the messengers, upon a straight path (Surah Yasin, 36:1–4). Three verses in, the address is unmistakable. Allah is speaking to the Prophet ﷺ, confirming his messengership under oath, at a time when Makkah was doubting him. It is among the most widely recited surahs in the Muslim world ever since.
Two letters, two views
The majority of commentators count Ya-Sin among the muqatta'at. These are the disconnected letters that open a number of surahs. Alif-Lam-Mim, Ta-Ha, Sad, Ha-Mim, Qaf, and Nun all belong to this same category. Their meaning is known to Allah alone. Al-Tabari, al-Qurtubi, and Ibn Kathir each record this view alongside other early opinions. None of them settles the question.
A separate strand of the tradition heard an address in the letters. Some read them as "O man." Others read them as a direct call to the Prophet ﷺ himself. Al-Qurtubi records this view too, and here it has an argument Ta-Ha does not: the surah's own grammar. Letters, then an oath by the Qur'an, then "indeed you are among the messengers." The address arrives within three verses. That proximity is what the reading leans on.
One thing is clear, both readings come from tafsir and early exegetical reports. Neither comes from a hadith. The Prophet ﷺ never named himself Ya-Sin the way he named himself al-Mahi, al-Hashir, and al-Aqib. Those three names appear together in one sahih narration. No such narration exists for Ya-Sin. And the Qur'an itself, though it names him Muhammad (Surah al-Fath, 48:29) and reports Isa (AS) foretelling him as Ahmad (Surah al-Saff, 61:6), never says that Ya-Sin is his name.
Later scholars discussed the question in both directions. Some declined to list Ya-Sin among his ﷺ names. Others accepted the usage as an expression of honor. This site presents both sides.
To carry this name
To carry this name is to be named from the opening of a surah where Allah swears by His own Book that His Messenger ﷺ is truthful and on a straight path (Surah Yasin, 36:1–4). It is to keep to that path yourself, especially when people around you doubt it. And it is to carry a name that a thousand years of Muslim families have chosen for a single reason: love of the man ﷺ that oath was sworn about.