"Why are you called Abu Yahya when you do not have a son?" He said: "The Messenger of Allah ﷺ gave me the Kunya of Abu Yahya."  

لِصُهَيْبٍ مَا لَكَ تَكْتَنِي بِأَبِي يَحْيَى وَلَيْسَ لَكَ وَلَدٌ قَالَ كَنَّانِي رَسُولُ اللَّهِ ﷺ بِأَبِي يَحْيَى  

"All of your wives have a Kunyah except me." He said: "You are Umm Abdullah".  

أَنَّهَا قَالَتْ لِلنَّبِيِّ ﷺ كُلُّ أَزْوَاجِكَ كَنَّيْتَهُ غَيْرِي قَالَ فَأَنْتِ أُمُّ عَبْدِ اللَّهِ  

"The Prophet ﷺ used to come to us and say to a brother of mine, who was small: 'O Abu Umair.'".  

كَانَ النَّبِيُّ ﷺ يَأْتِينَا فَيَقُولُ لأَخٍ لِي وَكَانَ صَغِيرًا يَا أَبَا عُمَيْرٍ