The lore information on naming conventions is awesome! But now, I have a question about the last name and what it represents. Is it the family name (i.e., father's or mother's surname)? Or something else?

For example, I'm thinking of a female Dunesfolk Lalafell named "Yayamo Yamo". The standard phoneme pattern for a female Dunesfolk Lalafell is AAB - AB, so her name works. But if she had a sister, I would assume her surname would also be Yamo. Given the phoneme pattern, wouldn't Yayamo's sister be stuck with the same name, "Yayamo"?

(And yes, I know I'm thinking about this too much...)