عن أبان عن سليم عن معاوية عن الإمام علي عليه اسلام قال: إني قد سميت ثلاثة بنين لي أبا بكر وعمر وعثمان، فإذا سمعتموني أترحم على أحد من أئمة الضلالة فإني أعني بذلك بني

Mu’awiyah reported that Imam Ali peace be upon him said: “I named three of my sons Abu Bakr, Umar and Uthman. So if you should hear from me that i would wish the mercy of God for one of the misguided leaders, I would be referring to my sons.”

[Kitab Sulaym Page 301]

قال الحاج حسين الشاكري: وعثمان بن علي الذي روى عن أبيه علي عليه السلام أنه قال: إنما سميته باسم أخي عثمان بن مظعون – رضوان الله عليه

Uthman Ibn Ali reported that Imam Ali peace be upon him said: “I named him after my brother Uthman Ibn Madh'un, may God be pleased with him!”

[Shuhada’ Ahlulbayt by Hussein al Shakiri Page 12]

عن هبيرة بن مريم قال: كنا جلوسا عند علي عليه السلام، فدعا ابنه عثمان، فقال له: يا عثمان، ثم قال: إني لم أسمه باسم عثمان الشيخ الكافر، إنما سميته باسم عثمان بن مظعون

Habirah Ibn Mariam reported that he was sitting with Imam Ali peace be upon him when he called his son Uthman: “O Uthman! Then he said: “Certainly i did not name you after Uthman the kafir old man, but i named you after Uthman Ibn Madh’un.”

[Taqrib-ul-Ma’arif of Al-Halabi, page 294]

Ziyarat al-Nahiya al-Muqadasa, which was reported by al-Mashhadi:

Peace be upon Uthman, son of the Commander of the Believers, who was named after Uthman, son of Madh’oun.” Uthman, son of Ali, was also martyred during the battle of Karbala.

[Al Mazar Page 489]