At my Baptism, my grandfather picked "Galonia" from a list of names the priest gave to him (my grandfather was an alcoholic, so I always wondered if that was a factor in the choice). I never use Galonia in real life, somehow when filling in school enrolment forms, if you put another name down, after a while it becomes your real name, even legally, which is pretty cool.
But when I had to start selecting usernames on the internet, my preferred names were always in use, but no one else ever uses Galonia, so that's who I am on the internet.
So maybe my grandfather had amazing foresight...