www.dailymail.co.uk/news/article-5989825/Britons-pick-favourite-spellings-long-contested-names.html
Found this while looking at a story from another thread.
Agree with all the boys' ones except Philip (looks right to me with one L) and Gerry (Jerry just makes me think of the cartoon).
Prefer Clare to Claire, but the variations on Ann(e), T(h)eresa and the many different spellings of Catherine and Lindsay (far more than they've listed) I'm just resigned to as they always seemed equally popular with no default.