I can’t claim to have read it cover to cover but there does seem to be an alphabetical list of variants that might help inspire you to vary your search strings and wildcards if you’re struggling to find someone. I must admit though I found myself pleasantly diverted by all the local examples of variants reported from around the country that he documented in the opening chapters – some of them are just hilarious … see page 28 … Nappy for Penelope?! Gobinet for Abigail?! Seriously though, there are some good examples that make you think as the equivalents are radically different words.
Enjoy!