The dictionary itself lists over 70,000 names along with many variations in spelling, and also gives translations of the original name into English. (Ellis Island strikes again!) Following the dictionary is an alpabetical listing of varients, so that if you can't find the name you are looking for as a main listing, you will be able to find out where it has been hidden.
I have spent many, many hours just reading listings in this book for entertainment, as well as using it as a reference tool for finding peoples names in the onomastic business. This one is definately a "must own" for anyone interested in names.