My original username was AzureDoctor. I made this a few years back and I simply combined my favourite colour with my dream job and I had a good username.
I came up with my current username while thinking up names for a character to use in a story that I was writing. The character's name was originally going to be Annika Flinn but it didn't have a nice ring to it. I found that a name sounds really nice when both the first and last names end with the same characters, so then I changed the name to Annika Flina and I was done.
I never actually got around to writing my story, so now the name is my screen name .-.