It is narrated from Sayyiduna Jabir (may Allah be pleased with him) that a child was born to an Ansari. He wanted to name him Muhammad. We said to him, "We will not allow you to do this until we ask the Prophet (peace and blessings be upon him)." So he placed his son on his shoulder and came to the Prophet (peace and blessings be upon him) and inquired. The Prophet (peace and blessings be upon him) said, "You may name him with my name, but do not use my kunyah for your kunyah."