What is the ruling on naming someone Abu al-Qasim or using it as a kunya?
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The Shaykh : Yes?
The questioner : What is the ruling for one who names his son Qasim and then takes the kunya Abu al-Qasim?
The Shaykh : Yes, there is nothing wrong with taking the kunya Abu al-Qasim, because the authentic prohibition of it was only during the time of the Messenger (peace and blessings be upon him), when people would call out "O Abu al-Qasim" and a person might assume it was the Messenger of Allah. In fact, a man once called out, "O Abu al-Qasim," and I think the Prophet (peace and blessings be upon him) turned around, so the man said, "I mean someone other than you." This is not a trivial matter. For this reason, taking the kunya Abu al-Qasim was prohibited during the time of the Messenger (peace and blessings be upon him), but after that, there is nothing wrong with it.
The questioner : What is the ruling for one who names his son Qasim and then takes the kunya Abu al-Qasim?
The Shaykh : Yes, there is nothing wrong with taking the kunya Abu al-Qasim, because the authentic prohibition of it was only during the time of the Messenger (peace and blessings be upon him), when people would call out "O Abu al-Qasim" and a person might assume it was the Messenger of Allah. In fact, a man once called out, "O Abu al-Qasim," and I think the Prophet (peace and blessings be upon him) turned around, so the man said, "I mean someone other than you." This is not a trivial matter. For this reason, taking the kunya Abu al-Qasim was prohibited during the time of the Messenger (peace and blessings be upon him), but after that, there is nothing wrong with it.