Tbh, I use my nickname on everything but I also include my first name (Nelly) on stuff as well.
It's a short name and it goes nicely together with the things I do.
On some, mostly private accounts, I go by "NHWK", which are my initials (and it rhymes in Swedish too, so that's cool!).
But tbh, You don't need to have a unique name, as long as you have a name that people can recognize you with.
I know alot of people who has these really super common swedish names and last names and they've all been able to manage to make a name for themselves.
What I'm trying to say is:
You don't really need to have a unique and special name for people to remember you, as long as you're consistent with your name, whether it be the nickname or your real name.
You can include some of your initials if they're not taken, use numbers as a last resort due to them being hard to remember.
When you publish things you can include your handle on the "about me" page (irl or online) so that people know where to find you online.
Also, my handle doesn't really represent what I do xD
It's just... A dumb thing I came up with and sometimes I regret not going by my old handle (NellyOnly) because nobody seems to be able to pronounce Chopythes xD