With having the entire galactic Republic on their tail, I doubt Obi-Wan and Yoda will be keeping their old names. Much like Luke and Leia will undoubtedly take the names of their foster parents (Luke Lars & Leia Organa) they will change theirs. In this thread we guess what pseudonyms our two remaining Jedi will be going by when we see them in Episode IV. The most obvious choice for Obi-Wan Kenobi would be Ken, though I'm not sure if a name like Ken is all too common in a Galaxy far far away. I was thinking perhaps something along the lines of Eugene? As for Yoda, I was thinking Yancy, though the possibilities are endless when it comes to Yoda, there's really no telling what he would come up with. Whatever it is though, it will undoubtedly have a Y in there somewhere.