>How much does a name define you.
It can be a tremendous amount, especially for mundanes, sometimes ever more influential than their stars.
Think of it as the primary affirmation that most have cast upon their being (by them selves or others) hands down. So the meaning of the name/word has a lot of effect upon your being. And unless socially isolate (this includes some places on the net as well) this will be a regular and often occurance and many dozens if not 100s of counter affirmations a day would be needed just to offset. To say nothing about the lifetime of inertia from that declaration of being.
>Does changing your name, not the legal name as in a government procedure, but changing the name by which you address yourself and have others address you create spiritual/astral change?
Yes, it would create a change, how big that one is also depends on your mental relation to it. What I mean is that I've seen folk that have "their name" (what they go by) and "their real name" (legal title). In their mind, even despite going by that for years, or decades, they and their social circle will refer to their alleged whole state of being as a mere facade over "what big brother says you actually are" and they, like cucks, take it.
So the problem is they are mentally, within their own view of reality, letting some outside being choose who and what they are and in doing so are giving up freewill over themselves Some aren't quite so bad but this thing is still a rampant problem even if simply within one's circle of friends. So long as you answer to, accept and resonance with outside demands that you are a thing you will be restricted in that way. Now of course you can not associate with such things yet still, for the sake of convince you may submit as a compromise of convince, I wouldn't suggest such however some prefer the easier way rather than the straightest way.
And in a roundabout way this is another strength of anonymity.
>The name my parents gave me apparently signifies health in babies but I was pretty sickly all my life and a malnourished childhood made me a manlet.
There are a lot of factors, that said, like all subtle influences it's effects are usually more apparent through the personality.
>I would experience the physical world a little differently if my ego persona wasn't John Doe but Dave Doe but it doesn't change who I am fundamentally, my inborn qualities and vices.
It would effect your predispositions, the specific trail you took through the pass, not the pass itself (innate qualities), though I must disagree with the concept of innate vices. We may have vices but I do not believe they are inseparable parts of our spirit.
>Even on a mundane level the genes your parents pass down to you determine a significant portion of who you'll most likely become.
Not just genes but also their psychic imprints (subtle genes) as well.
>Nothing is truly hardcoded.
This is misleading, though true. With enough force of will one can fight the cosmic tides of the world, fate, and the will of heaven itself if desired, force making anything anything, however it's much easier to go with the flow, cocreating. Though careful observation one can see the transitive truths about the intrinsic power emanating from a given geometry.