A:
It is permissible to
carry the grandfather's name since he is the father of your father. The Prophet (peace be upon him) said:
"I am the Prophet, it is not a lie. I am the son of `Abdul-Muttalib."
He said that even though
`Abdul-Muttalib (Part No. 20; Page No. 368) was his paternal grandfather. The Prophet's name is Muhammad ibn `Abdullah ibn `Abdul-Muttalib. At the same time, a Muslim has to register their father's name in order to avoid any confusion when it comes to matters related to inheritance and the like. May Allah grant us success. May peace and blessings be upon our Prophet Muhammad, his family, and Companions.