Indeed Ruby there is a lot of evidence that the Yaho form of the divine name was commonly used in the first century, and the preponderance of the evidence is that forms of the divine name were used in the LXX of the period. The question then becomes, why assume that the Christians in this period didn't likewise use the divine name? Other than religious bias against the name, there don't seem to be very good reasons for making that assumption. Have you read the book? It sounds like you have. It's really an amazing book for someone like me, who has been interested in this topic for nearly 20 years, since I was a teenager, and thought I knew most of what there was to know about it. And now to read this book and all the additional evidence it contains about onomatica, Roman and Jewish sources, and from a textual criticism perspective, that shows Yaho was commonly used in the first century and likely used by the first Christians is an eye opener. It is crammed full of interesting information on every page and every footnote.