Not a complete list of quoted works!
However, while the majority of these were found during the course of my own reading, an awful lot also came from the following:
Leslie Dunkling, First Names First (Dent, 1977)
Grace Hamlin, The Penguin Classic Baby Name Book (Penguin, 2001)
Ivor Brown, A Charm of Names (Bodley Head, 1972)
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If there are quote a few quotes from the same authors, this is due both to my (occasionally) limited reading, but the fact that some authors have a tendency to comment on names and some don’t. (For instance, Georgette Heyer, P G Wodehouse, Terry Pratchett, L M Montgomery and Elinor M. Brent-Dyer among others just can’t seem to pass up an opportunity to say something on the subject.)