I am due on 26th April and still dont have a shortlist yet!!!
I have used www.babynamewizard.com/voyager to check popularity of names I like and babynamesworld.com to look at names from around the world.
Considering I havent found names yet I dont know if these are really that great but they are fun. And it's good to see if you really like a name how much it's been used over the years!!??(it is a US site))
I havent found a site that is any better or worse than these two and they seem to have a lot of variety.
NT Mum, Keely 23/4/04 & EDD 26/4/06