In addition to numerous cross-references, this treasury of baby names features detailed definitions consisting of origin, meaning, famous namesakes, popularity, nicknames, and unusual spellings. Original.
This one is sort of annoying because they list each different variation or spelling of a name as an individual entry. So, you end up skipping over whole columns or even pages of names sometimes. Also, the "popular", "less popular" "unusual" categories are not only undefined, but out of date given the year of publishing. Lastly, I didn't see any names in here that I haven't seen in other baby name books.