"Yasin" (یٰس) is one of the names of the Prophet ﷺ, so it is permissible to use this name. It belongs to the huruf al-muqatta'at (the disconnected letters of the Quran), and its meaning is known to Allah alone.
Allah the Almighty knows best.
Darul Ifta Al-Ikhlas, Karachi.
فتح القدير للشوكاني: (412/4، ط: دار ابن کثیر)
وَقَالَ سَعِيدُ بْنُ جُبَيْرٍ وَغَيْرُهُ:هُوَ اسْمٌ مِنْ أَسْمَاءِ محمّد صلّى الله عليه وَسَلَّمَ دَلِيلُهُ إِنَّكَ لَمِنَ الْمُرْسَلِينَ