The change of names over time

[Creativetides]

I might say reflect the cultures of the area by making some cities having words and names associated with one culture while another represents a different culture. as a real life example look at a map of Spain or Northern Morocco you may notice some islands and cities in more southern regions of Spain or North Morocco have names that contain both Spanish and Arabic routes for the city's name, due to the occupation and influence of the Islamic empires that at one point controlled the region. In short try to reflect gradual shift in the sound and way names and cities are spelled/pronounced to show their cultural influence.