Idea 1: Countries of history (meaning using the pre-20th century names of the countries, such as ): Persia (Iran), Mesopotamia (Iraq), Abyssinia (Ethiopia), Ceylon (Sri Lanka), Siam (Thailand), Gaul (France), Burma (Myanmar), Kampuchea (Cambodia) and several African countries. Many country names would stay the same, though.
Idea 2: Names of historical noble and royal houses such as Windsor, Hanover, Oldenburg, Anjou, Bourbon, Orleans, Devonshire, St. Albans, Etc.
Idea 3: Derivation of names of famous Shakespeare characters: Oberonia, Titania, Romero, Juliencia, Hamlette, Othellor, Macbethel, etc.