Musnad Ahmad 32:190

Yahya ibn Sa'id narrated to us, from Humayd, from Anas, that the Messenger of Allah (peace and blessings of Allah be upon him) was in al-Baqi', and a man called out, "O Abu al-Qasim!" He turned toward him, and the man said, "I did not mean you." He (the Prophet) said: "Name yourselves with my name, but do not use my kunyah (patronymic)."