Well, Penny comes from my real name, Penelope, but Penny is way easier to type

My surname Bilkus, is a different spelling of my real surname. My real surname's Lithuanian and "Bilkus" is how we spell it to most people as they can pronounce it
I needed something I could remember, but I realised I had quite a good memory as I made up a username for another site. That one was "Hayden Alanna Lisbeth Odilia Tiasa" and I actually managed to remember it
I wish I'd chosen something more interesting.
Like Fionnuala Lesen. Fionnuala is the Irish version of Penelope. And Lesen is my favourite activity, reading!