Is it recommended for his family to name his son on the basis of that which is connected to astrology and soothsaying?
Question

                I am an Italian revert and we live in the UK, together with my husband's family. My husband and I are expecting a baby in December, insh'Allah, and my father in law suggested that we should choose a name for our child that starts with the letter F - this is because the baby is expected in December. All children in their family have been named in this way - the initial of the first name is chosen based on the month (or date?) when the baby is born. I assume this has to do with astrology / numerology? I have read different articles from different sources (including this website) on what the ruling on naming children in Islam is, and I have found no reference to this anywhere. Also, talking to other Muslims, including Muslims of Pakistani origins, it emerged that this practice is not at all widespread. I have learnt that the name given to the child should have a good meaning but have not read anything about restricting the choice to a particular initial. I would like to know what the ruling is on using these numerology aids in choosing a baby's name. Is this Islamic? Or is this haram? And if this is not Islamic, should myself and my husband follow his father's advice anyway for the sake of keeping a tradition and avoid hard feelings within family members? If you could answer these questions for me it would be greatly appreciated.
Praise be to Allah.
    There is nothing wrong with naming children on the basis of 
    events or times that coincide with their birth. There are people who called 
    their daughters Marwah or Safa because news of the wife's pregnancy reached 
    them in the sanctuary in Makkah, or because they were on the hills of 
    al-Safa and al-Marwah. Some of them called their son Badr because his birth 
    coincided with the Battle of Badr. Some of them called their son Ramadan or 
    Sha’baan because they were born in one of these two months. There is nothing 
    wrong with any of these things, because they are not contrary to sharee’ah. 

    Similarly, there is nothing wrong with the father giving all 
    his children names that start with the letter meem or alif, as some of them 
    do. The matter is broad in scope. 

    What matters in all these choices is that this should have no 
    connection to soothsaying or any other belief that is contrary to sharee’ah. 
    The one who believes that if he gives his son or daughter names such as we 
    have mentioned above, this will bring his child good luck, or that he will 
    attain a high position or wealth, is forbidden to use this name, because 
    beliefs such as this have no basis in Islam; rather they are myths that stem 
    from superstition and soothsaying. 

    Based on that, if you discover the truth of the matter and 
    that your husband's family believe these myths about naming children, then 
    you should not agree to what they want, even if that leads to them resenting 
    you, because these traditions and customs that are contrary to sharee’ah 
    must be resisted and opposed until the people turn away from them. 

    Before that, you have to explain to them, kindly and gently, 
    the error of what they believe and what they want to do, and that it has 
    nothing to do with the happiness of the child. 

    If they respond, then praise be to Allaah. Otherwise you have 
    no choice but to go against their wishes and choose a good name for your 
    son. 

    If you are wise and you go along with what they want, then 
    who will put an end to this chain of myths? 

    We ask Allaah to guide you all to the right path. 

    And Allaah knows best.