Mine is derived from my northern European mongrel heritage. My paternal grandfather was a full blooded Norwegian, named Odean; obviously a reference to the Norse god Odin.
Both of my maternal grandparents were second generation German. So I combined my Norse and German heritage and Germanized Odin to Wodan or Woden. Both were somewhat overused across the internet so I chose a misspelling and came up with Wodin.
A bit of searching revealed the only uses of Wodin were a
somewhat obscure artist and
a nuts and bolts factory in Ohio, so Wodin it became.
edit: it has since become a little more prevalent among the gaming community.