Musnad Ahmad 32:278

Yazid ibn Harun narrated to us, Humayd informed us, and Abdullah ibn Bakr informed us, Humayd informed us, from Anas, that the Messenger of Allah (peace and blessings of Allah be upon him) was in al-Baqi', and a man called out to another man, "O Abu al-Qasim!" The Prophet (peace and blessings of Allah be upon him) turned around, and the man said, "I did not mean you, O Messenger of Allah; I only meant so-and-so." The Messenger of Allah (peace and blessings of Allah be upon him) said, "Name yourselves with my name, but do not use my kunya (patronymic)." Abdullah ibn Bakr said in his narration: "Name yourselves with my name."