Greg
I thought you were asking how the names “San Lewis and Cumbers” are pronounced. In reviewing your original post, you ask about San Lewis. How you do it in your work is certainly up to you. The local pronunciations are basically a cross of Spanish and English slang but none-the-less is how the names are pronounced by us uncivilized locals out here in the wild, in narrow gauge country. If you choose any other way, you will sound like an outsider from Cinncinatta trying to correct local accent; no way. When in Rome-----
Good Luck
Woody W