If you're going to perform a comprehensive scan (i.e. not just to sample alexa's 1M), there's a lot of crap waiting for you in the long tail -- you may want to use my subset of alexa's rankings instead, which contains only names that have been on the list for the last 322 days (it's ~700K rows): http://www.szejda.pl/pub/alexa-20130313-20140128.bz2