Musnad Ahmad 1116
It was narrated that Hubairah bin Yareem said:
We were with ‘Ali and he called a son of his who was called ‘Uthman and he had a lock of hair.
حَدَّثَنَا عَبْد اللَّهِ، حَدَّثَنِي عَلِيُّ بْنُ حَكِيمٍ الْأَوْدِيُّ، حَدَّثَنَا شَرِيكٌ، عَنْ أَبِي إِسْحَاقَ، عَنْ هُبَيْرَةَ بْنِ يَرِيمَ، قَالَ كُنَّا مَعَ عَلِيٍّ فَدَعَا ابْنًا لَهُ يُقَالُ لَهُ عُثْمَانُ لَهُ ذُؤَابَةٌ‏.‏