This document discusses two methods for determining the geographic origin of surnames based on bibliographic data. The first method uses Kullback-Leibler divergence to assign surnames to the country with the highest frequency and levels of assurance. The second method uses the Gini index to assign surnames to the country with the highest concentration. Both methods are validated against a "golden list" of surnames assigned to countries based on language, ethnicity, and historical origin. Results show the Gini index method has higher accuracy for some countries but lower coverage overall. Further validation over time is needed to account for migratory movements.