Without looking at the site, I can easily say that my married name is most popular in Lebanon, and my maiden name occurs nowhere else as often as in Iceland. Immigrant parents, immigrant husband.
EDIT: After checking the site, I'm disappointed. It seems to be designed only for Western names (US, Europe, Australia/NZ), and they don't seem to have ANY Icelandic names. Lame!!! And Lebanon doesn't even appear to be on their map. My married name came up as most popular in Switzerland... hahaha. Maybe there are a lot of Lebanese there, but that's not where the name comes from.