I chose "Astrid" because I payed for a ancestry genealogy test recently and found I am 29% Scandinavian, 24% Irish, 23% British, and 14% continental Western European along with 6%-1% in some lesser areas around Europe. I have been wanting to change my name for many years because I really don't like my name and I think it is a relic of the past, and nowadays, every time someone says my name it means I've done something wrong and in trouble. In the past (read: three month ago and before), I wanted a name that fit with my religion and that didn't work out too well as I end up believing/being attracted to a different religion almost every year (my idea of morality and system of ethics changes a lot and I want what I believe to actually match a religious practice) nor did I want to give up that part of me, so my name would have had three first names, four middle names and a last name, which is absurdly long. So I decided to choose a name based on my ancestry (because until recently I have hated my race/ethnicity, I'm working on accepting my gender now, which is even harder), I've been torn between Astrid and Ingrid, I'm leaning towards Astrid, I don't think I'll choose it as my first name, but maybe as a middle name.
Also there was a book I read many years ago, it's a YA novel called "White Oleanders" the protagonist was a girl named Astrid and to a small extent, I identified with her. When I registered, "Astrid" was already taken so I was going to add 123, but I decided on 112 which of course, is the inverse of the suicide hotline, so it fit I guess.
I might change it to "Angel of Pain and Misery" because that is what I called my website, and the name still applies of course.