'Zarconite' doesn't really have a meaning but it came from me wanting to have a more evil sounding name for my death knight on World of Warcraft
Initially I went with Zarconic which was a mix of 'Nucleonic, my previous name and just picking a letter and seeing what fit with it
Eventually I combined Zarconic with the map addon 'Carbonite' to form Zarconite
And so, I now use this name on pretty much everything I use, It isn't ever taken on anything I want to register for, which is a bonus