It could be a translation error, or at least I could definitely see how a translation error could happen with it. Though, I guess it could also be that they have retconned it, to put a greater emphasis on the fact that the name is passed down from the mother. What it just completely misses out on, if we assume the latter is correct, is where the names like Relahna etc fit into the female name. If their name is only meant to be a homage to their mother and not a name passed down from a mother (presumably) many years ago, which I think was/is the origin of those names. Unless they really mean for those to be thought of as first names and not surnames, but then why does keeper men have the option to have them? Surely we're not out in a (Mother's First Name)'(number of male) (Also mothers first name) situation.
