(Do Not Change Your Names)
You shall give your adopted children names that preserve their relationship to their genetic parents. This is more equitable in the sight of God. If you do not know their parents, then, as your brethren in religion, you shall treat them as members of your family. You do not commit a sin if you make a mistake in this respect; you are responsible for your purposeful intentions. God is Forgiver, Most Merciful.
ادعوهُم لِـٔابائِهِم هُوَ أَقسَطُ عِندَ اللَّهِ فَإِن لَم تَعلَموا ءاباءَهُم فَإِخوٰنُكُم فِى الدّينِ وَمَوٰليكُم وَلَيسَ عَلَيكُم جُناحٌ فيما أَخطَأتُم بِهِ وَلٰكِن ما تَعَمَّدَت قُلوبُكُم وَكانَ اللَّهُ غَفورًا رَحيمًا
ud’oohum li aabaaa’ihim huwa aqsatu ‘indal laah; fa illam ta’lamooo aabaaa’ahum fa ikhwaanukum fid deeni wa mawaaleekum; wa laisa ‘alaikum junaahun feemaaa akhtaatum bihee wa laakim maa ta’ammadat quloobukum; wa kaanal laahu Ghafoorar Raheemaa