Aamir bin Abdullah bin Zubair narrates from his father (Sayyiduna Abdullah bin Zubair, may Allah be pleased with them both): The name of Sayyiduna Abu Bakr (may Allah be pleased with him) was Abdullah bin Uthman. The Prophet Muhammad (peace and blessings be upon him) said to him: "You are a person freed from Hell by Allah Almighty." Because of this, he was named Atiq (i.e., the freed one).
Hadith Referenceصحیح ابن حبان / كتاب إخباره ﷺ عن مناقب الصحابة رجالهم ونسائهم بذكر أسمائهم رضوان الله عليهم أجمعين / 6864
Hadith Gradingفضيلة الشيخ الإمام محمد ناصر الدين الألبانيصحيح - «المشكاة» (6022 / التحقيق الثاني).فضيلة الشيخ العلّامة شُعيب الأرناؤوطإسناده صحيح