I always wanted to name a dog "Rowdy", but wanted it to be short for something; all I came up with was "Rowena", which (if I remember correctly) is from "Ivanhoe".
A friend's husky is named Russell; he said it was after Bertrand Russell, the philosopher. He considered "Bertrand" but thought Russell sounded better.
I find there are a lot dogs named "Daisy", "Charlie", and "Thor" or "Loki".