It is narrated from Sayyiduna Anas (may Allah be pleased with him) that the Prophet (peace and blessings of Allah be upon him) was in the market when a man called out: "O Abu al-Qasim!" The Prophet (peace be upon him) turned towards him, so the man said: "I was calling him," meaning another person. Then the Prophet (peace be upon him) said: "Name yourselves with my name, but do not take my kunyah (Abu al-Qasim) as your kunyah."