Well Dwotci is some kind of an acronym for "dweller of the city", and this is a bit modified version of a nickname I had when I was, like, 10 years old.
devast8a was the account name of a "Dark Throne" myself a mate, and his mate used to play on. I couldn't come up with a name so I used it for my Xbox Live GT and it's stuck ever since.
for yew101 i just thought the word yew sounded cool and ve used it for years, the 101=favourite 3 digit number. i made this name before i ever knew there was a tree called yew tree.