Barakallahu feek shaykh if I name myself as Sa'di as a nickname is this the Haram of naming myself with other than my father's name or lineage or is it halal like hanbali shafi and so on my niyyah is just because I like the shaykh not to join with his lineage or anything barakallahu feek shaykh

Ustadh AbdulAziz al-Haqqan

I do not fully understand your question, and I believe that is because of waswas. Because you are just giving yourself a nickname, how did we end up saying that you have attributed yourself to another lineage altogether? These are totally separate things.