From what I've seen so far (and sorry for digging this up but it's relevant to the topic) there certainly is an interesting way in which Mystel are named. Here's a few I've come across where I've paired their names up and assume they are of close family:
Sue-Rend (M) (father)
Renda-Sue (F) (first-born daughter)
The similar naming thing is a strong indication one is the offspring of the other, if you read further down it's likely Renda is the daughter of Sue
*Mei-Tatch (M) (father)
Tatcha-Roi (F) (mother)
Tatcha-Mei (F) (first-born daughter)
Shee-Tatch (M) (child)
*As above however Mei is of a different clan
*Kee-Satt (M) (father)
Sasha-Kee (F) (mother)
Shai-Satt (M) (child)
*As above
Rae-Qesh (M) (father)
Sasha-Rae (F) (mother)
Qeshi-Rae (F) (first-born daughter)
Sasha is probably the wife of Rae with Qeshi as their daughter
Moa-Mosch (M) (father)
Zumie-Moa (F) (mother)
Mosha-Moa (F) (first-born daughter)
Zao-Mosch (M) (child)
*Moshei-Lea (F) (child?)
Possibly couples and offspring
*may be part of the family
Tio-Reeq (M) (brother?)
Vroi-Reeq (M) (brother?)
Lue-Reeq (M) (brother?)
Since both are male this would indicate they're likely brothers or one may be a father of the other 2
Mao-Ladd (M) (brother)
Chei-Ladd (M) (brother)
As above
Nunsi-Lue (F) (mother)
Chora-Lue (F) (first-born daughter)
Zoi-Chorr (M) (child)
Bea-Chorr (M) (child)
Due to their naming it's most likely they're related
Chai-Nuzz (M) (husband)
Dulia-Chai (F) (wife)
Confirmed husband/wife duo on the First
Zia-Bostt (M) (husband?)
Bosta-Loe (F) (wife?)
Similarity in names might indicate they're a couple
There seems to also be a near-balance of male/female ratio, however there are very few of the darker clan in comparison to the lighter clan at a ratio of 1:10. The different clans share the same naming system and it would also seem the same marital system which may be more closer to Keepers of the Sun than Hyur as I've often come across names split across the continent with very few actually remaining together in the same location like with the Chai couple. It also appears they are not limited to only mating with those of the same clan as with the Tatch and Satt families, this might be down to their dwindling numbers, however it appears that the lighter clan gene is more dominant as none of their children carry the darker clan gene.
From what we know married females have their given name followed by the given name of their partner. This is why I think that Sasha-Rae and Rae-Qesh are most likely husband/wife and Qeshi-Rae is most likely their daughter. From the looks of it the daughter's given name as their father's family name and ending in an A or I and SCH replaced with SH, whilst the sons' family name is the same as their fathers' given name. This indicates that Mei-Tatch is the father of Tatcha-Mei rather than the other way round since Mei is from a different clan, leaving Shee-Tatch as possibly his son and Tatcha-Roi as possibly his wife.
Since we've kinda determined that daughter's given names are similar to their father's names then this would indicate that the Lue couple are a mother/daughter pair and are part of the Chorr family rather than being related to Lue-Reeq (unless he took them both as mates which then puts Tio and Vroi as possibly his sons and either Zoi or Bea could've been a previous partner.)
I did look at other other pairings such as Moshei-Lea maybe being a daughter from the Moa family. If Moshei is from the Moa family then this would indicate the first born daughter is named after the father with their names reversed, so Mosha-Moa would be their first daughter.