Oh, and it seems like Lukas hasn't been matched up with Luke/Luka and Alejandro with Alexander/Aleksandar.
Concerning the name Kim, first of all this is a family name not a given name. That's the main reason it is not on this quiz. Though it *does* show up here: Most Common Surnames.
Also, I think your stats are off. It's my understanding that roughly 60% of the people in Korea have one of three family names: Kim, Pak/Park, and Lee. Of those three very common family names, Kim is the most common, but I think it's still less than 25% of the country. To my knowledge, Nguyen is the most common family name per capita in any country in the world. Around 25% of everyone in Vietnam has that name.
My suggestions: Gabriela should work for Gabrielle (it's the spanish version), and you should mash Lukas up with all the Luke and Luka stuff
More people named their daughters Yua using 結愛 than Yui using 結衣 (the most common kanji choice for Yui), so that became the "top" name on RocketNews24, from which wikipedia made their list, even though Yui (written any way) is twice as popular as Yua (written any way). A linguistic quirk.
Great quiz, kal, a real challenge.