Musnad Abu Ya'la al-Mawsili 129:70

Ibrahim ibn al-Hajjaj narrated to us, Hammad narrated to us, from Humayd, from Anas, that the Messenger of Allah (ﷺ) was in al-Baqi', and a man called out, "O Abu al-Qasim!" The Messenger of Allah (ﷺ) turned around, and the man said, "It is not you whom I meant." So he (ﷺ) said, "Name yourselves with my name, but do not use my kunya (patronymic)."