Question about the name Ffayy – is it permissible to give this name to one’s child?
Question

                What is the meaning of the name Ffayy? Is it a permissible and good name? Because I found that it has some meaning for the People of the Book. Is it permissible to use this name?.
Praise be to Allah.
      We have not found the name Ffayy in the sources available 
      to us, therefore we do not know what its meaning is, so we cannot issue a 
      ruling on it. Unless its origin is the word fay’, and the final hamzah has 
      become assimilated into the ya’ that precedes it. Fay’ means a shadow. 
      However it cannot be imagined that the first letter (fa’) could be doubled 
      in Arabic at all! 

    Names such as this, that are not known as names and are not 
    used among Muslims should be avoided altogether when naming one's children. 
    Coming up with strange things is not praiseworthy with regard to names and 
    it may lead to negative consequences in the future for the person who is 
    given this name. 

    Whatever the case, we have previously listed some important 
    guidelines for naming by boys and girls and what should be avoided. Please 
    see the answer to questions no. 7180 and 
    101401. Whoever follows these 
    guidelines and avoids what is warned against will be safe from anything that 
    is contrary to sharee‘ah in sha Allah. 

    And Allah knows best.