Why isn't Wednesday spelled Wednesday?

Maybe it will be spelled that way one day. Wednesday celebrates the god Odin, in the same way that Thursday celebrates Thor and Saturday celebrates Saturn. So at one point the day was referred to as Odin's Day, or Wodin's Day. Pronunciations changed over the centuries, and spelling has become more or less standardized roughly over the last century. As English continues to grow and change, the spelling of the day may become Wensday, or maybe even Ensday. But even in these spellings, you can still see how the word stays connected to its roots in the name Odin, or Wodin.