"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."
Sunan Ibn Majah Book 33, Hadith 82
← Previous Hadith "The Messenger of Allah(ﷺ) was in Baqi', and a man called out to another man: 'O Abul-Qasim!' The Messenger of Allah(ﷺ) turned to him, and he said: 'I didn't mean you.' The Messenger of Allah(ﷺ) said: 'Call yourselves by my name but do not call yourselves by my Kunyah.'"

Sunan Ibn Majah Book 33, Hadith 81 Next Hadith → "All of your wives have a Kunyah except me." He said: "You are Umm Abdullah".

Sunan Ibn Majah Book 33, Hadith 83