Ketubah, ketuba, kettubbah, ketubbah, kattuba, kettubah…. Whichever way you spell it, a search on the internet for any of the various spellings should yield results. It’s like Chanukah (or Channuka, Hannukkah, Hanukkah, Hanuka....you get the picture). As you can see, Ketubah Graphia has chosen one consistent spelling. It just makes it easier that way.