http://www.justbabynames.com/

http://www.babynames.com/

http://www.behindthename.com/

http://surnames.behindthename.com/

http://www.babynamewizard.com/voyager

http://www.ssa.gov/OACT/babynames/

http://www.kleimo.com/random/name.cfm

http://www.wesclark.com/ubn/top.html

And some "language" sites to help with making up your own names:

http://www.beginnersgame.com/esata.html

http://www.zompist.com/kit.html

http://www.zompist.com/