Interesting list. You should allow type-ins -- last names only and initials for those know by their initials (MLK or FDR). You might also allow for alternate spellings for some such as Mohammed. And finally Bismarck is spelled wrong.
I made several lists similar to this -- top 100 of the millennium or century. Instead of listing the country, I gave clues to why they were thought to be the most important. This would make it a quiz of knowledge rather than simply guess the most important people from that particular area/country.