My screen name has had a few variations. It started out as simply "Zephyr", a word for a gentle wind. I've always liked wind and storms, and in video games it's usually my elemental affinity. I also thought it was cool-sounding and suitable for a person's name. I eventually modified it because it was sometimes taken already on websites and games.
I ended up settling on the gendered "Zephyria", which sounds like "Valkyria" (for those familiar with the game series/anime). Also "Zephie" for short~