vika - your question was about Trotsky. I don't know why I decided that you were asking about Lenin

Mainly because the thread was about Lenin, and I had gone off on a tangent!! (just for a change)

I have been searching a bit since I asked why Leon T chose his pseudonym He took the name in 1902, when he escaped from exile in Siberia (a sentence imposed on him in 1897 for organising the workers in Nikolayev into the Southern Russian Workers Union. But so far, I can't find out what is the significance of the name.

Edit This is a simplified, but reasonably useful, biography, complete with pictures, of Trotsky. Still doesn't explain his pseudo, though! [sigh]
http://www.fbuch.com/leon.htm