Assalam o Alaikum one of my friend name is Rasool Muhammad. is this name is correct and what is the meaning of this name
Rasool in Arabic means messenger. Muhammad is the name of our Prophet ().
In Arabic Rasool Muhammad makes only sense if you spoke of somebody who has been sent out by -a person called- Muhammad to deliver a message, as Rasool would be an adjective. In that case it would mean "Messenger of Muhammad".
Each word of this possible name makes sense and doesn't go against any naming conventions in Islam even if it might sound strange as a name for an Arabic speaker. But this is not a reason to say it is incorrect or not allowed.