Narrated Anas bin Malik (may Allah be pleased with him): The Prophet (peace and blessings of Allah be upon him) was once in the market when a man called out, "O Abu al-Qasim!" The Prophet (peace and blessings of Allah be upon him) turned towards him. The man said, "I was calling that person, not you." The Prophet (peace and blessings of Allah be upon him) said: "Name yourselves with my name, but do not use my kunya (nickname)."