@Medea I think its a great idea for a Weekly Challenge & thats great that your name has that meaning for you in your practice.
My reasons for choosing the name I use in the forum is the word Siofra is Irish/Celtic for changeling, elf, mischievous (paraphrasing for an idea of the meaning)… & when I chose it, I am mostly Irish & very connected to Celtic
Irish
beliefs & practices but at the time I was scattered & everywhere & no idea what I was doing & just everywhere with everything. Also why my current badge is Master of Chaos.
I’m also Italian
& Strega is actually Italian for witch & I am connected to that side of myself also through my family & upbringing.
So yes I am connected to it in that way for a witch name. Yes, I am connected to it & I can say its my witch name within the coven Infinite Roots
& thinking about it, more than a username because there are actual connections to the name aside from username for me. 
I think its great that you have connection to your name too! It should be something connected to you & your practice for use however you would like within your craft.
It’s absolutely a great idea to explore how people would choose one or how they would come to someone.
There’s many ways that it could be approached also. Should it be given, chosen, used all the time, privately, within ritual or spellwork only.
There was a misunderstanding of the post & I apologize for that, I use mine within the forum only.

I was in no way trying to discourage you or anyone else from exploring the topic or having a witch
name. Or from it being a weekly challenge topic.
We do have many members & its a good topic to explore & how it would fit within someones practice. Whether only within the forum or elsewhere & how it would be used for them. Or if at all.
I’m sorry for the misunderstanding. I meant no ill will or offense to anyone who has chosen their name for any reason. It’s going to be up to each person & everyone will have a different reason for or for not using one here or elsewhere.
Again, sorry for the misunderstanding 