It is narrated from Hazrat Anas (may Allah be pleased with him) that once the Prophet (peace and blessings be upon him) was in Jannat al-Baqi', when a man called out to someone by saying "Abu al-Qasim." The Prophet (peace and blessings be upon him) turned around and looked back, so the man said, "I did not mean you." Upon this, the Prophet (peace and blessings be upon him) said, "Name yourselves after my name, but do not take my kunyah (patronymic) as your kunyah."