Sometimes nameberry has rankings. I just read an article on there the other day citing Italy's version of the SSA list, I think the article was called something like "le tante sorrelle di Isabella." You can get Puerto Rico's list through the SSA site by "state/territory." Try google with the ending of the country in question instead of google.com, assuming you speak the language of the country you are looking for, so google.pt for Portugal or google.ar for Argentina, etc.
Another thought for popular foreign names is to look at the "friends" list of friends of yours on facebook who may come from the countries you're looking at. I get some good name ideas from my Brazilian and Italian friends on FB (and not so good ones from friends who come from countries where everyone in my age group seems to be named the same thing).
Re: popular foreign names
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Freyja Marjorie Belle
11.11.10 - 5 pounds 15 ounces