Names After an Eternal Bond Between Sun and Moon Miqo'te

[Vidu]

It would be my understanding that neither the Seekers nor the Keepers share our idea of taking their spouses name after getting married - their societies both seem to center around either a strong mother or father figure.

Especially the Seekers dont even seem to live monogamous, as you probably know and there is no real indication (apart from the tribe-letter) that a female Miqo'te might "belong" to a male Miqo'te or rather a nunh in this case.
Taking her name - or rather: her tribe-letter - would, if you want to stay lore-conform, require you to also change your last name to either Tia or Nunh.
I would see that as a feasible option - with changing your name to Nunh being the better one, probably - seeing how a Seeker-Male can become a Nunh by leaving his tribe and starting his own family, which would be what you and your wife are kinda doing, I guess... thats probably not 100% correct lorewise, but I think its an explantion one could live with.

One other thing I could think of, that would bend the naming-conventions a bit, but would probably be the more "romantic" option is to change your surname in a way that includes her surname. Keeper naming conventions actually "require" you to have both your for- and surname include the ones of your mother. Seeing how the Keepers are so centered around mothers, I'd figure they wouldnt mind to much if one of your names would actually derive from the one that the (potenial, only figuratively speaking here) mother of your children has.
I'm not sure if this would really fit with the techincal naming-conventions of the Keepers, but I could at least see it fit with the spirit of them: A culture centered around women and your names being reflections of the two most important women in your life.

I'm not a Miqo'te-expert, but I'd figure that my first-suggestion would be the more lore-accurate one, specially if you change to a Seeker yourself. Depending on wether or not you and your wife choose to "leave" her tribe and start your own little harem (if I'm giving you ideas, I hope shes not taking that out on me...) you'd either have to change to Tia or Nunh.

Personally, I'd like the Keeper-idea better though and even if it doesnt follow the naming-conventions, I think it would be lore-conform with the matriarchal society the Keepers keep. So I'd go with that, even if its maybe less accurate.
I'm not sure how much you're into roleplaying here, but I would consider my second option also the more "natural" one for a Keeper-male if you think about how he most have grown up in a society centered around women as leaders - in the position of a Nunh or potentially even a Tia he would be thrown into a leadership-position. And without that "converting" to the Seekers way of life would mean converting to a way of life that centers around males.

In the end it comes down to what you're more comfortable with yourself, I guess - and how much you care about the implications of your name and the lore and "background" attached to it.