2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/164827Although cumulative family name distributions in many countries exhibit power-law forms, there also exist counterexamples. The origin of different family name distributions across countries is discussed analytically in the framework of a population dynamics model. Combined with empirical observations made, it is suggested that those differences in distributions are closely related with the rate of appearance of new family names.7 pages, 8 figuresPhysics and SocietyBiological Physicstext