My name is Mathias, which means "Gift of God" in hebrew, but it exists in three forms in my language. The official version (Maciej), Maciek - for friends, and Macius - for children.
When I was a child, I didn't like my name at all, but most of all I hated when someone called me Maciej or Maciek.
Macius kind of sticked to me, perhaps to distingush me from other Maciejs in class. I always looked younger than I was in reality. But I am still called Macius by some of my friends, and no, they didn't know me in my childhood.
My second name is Olgierd, which is an old lithuanian name (Algerdas), meaning something like "the brave one" or whatever. Doesn't fit me at all, but it is a nice name and rare. Strange is that it's a baptisement name, and original Algerdas was not even christian (some say he was baptised secretely, though), not to mention a saint.
In catholicism, we have a sacrament called (in polish) bierzmowanie, I don't know its english name (somebody plz tell me). It's when You finally become full-right member of the church. You chose your third name, then (or rather yoru saint patron). I wanted to be named Orhan (I really like that name) or Demetrios (I was really into turkish and late byzantine history back then). But Orhan is a turkish name, and the priest ordered us to find a saint of this name, so I couldn't take that name

. There is saint Demetrios, patron of Thessalonike, but I recalled his name in polish is Dymitr, and it seemed much less appealing than Demetrios.
I decided to name myself Constantine, but somehow ended with Constantius, because St Constantius seemed a good man when I read about him.