Why do Haurchefant, Estinien and Yugiri have Hyuran last name?

[Yuella]

Greystone, Wyrmblood, Mistwalker. Or maybe they're just nicknames instead of last names?

[PArcher]

Greystone is the last name of all Ishgardian bastards (which means it is also the "true" last name of Hilda and Aymeric).

Wyrmblood and Mistwalker are more likely titles than last names

[TinyRedLeaf]

In Yugiri's case, "Mistwalker" is more than just a title, but also an allusion to her given name, which means "Evening Mist" [ 夕 霧 ]. I wrote more about this back in December last year.

It appears to be a naming convention peculiar to the shinobi of Doma, as the Au Ra princess who appears in the post-level-50 ninja quests, Yuki, does in fact have a Doman surname. Her full name is Yuki Yatsurugi.

But the Doman shinobi who appeared in the pre-level-50 quests are also named the same way as Yugiri. For example, Oboro ("hazy moon") Moonrise and Karasu ("crow") Redbeak.

[Valenth]

Apparently it's not uncommon for Au Ra to take on more Eorzean names when wandering away from Doma (or at least in Xaela's case). I figure this is them taking on the Eorzean version of their original Doman names.

Edit: I based my Au Ra's name, Valenth Guiran, on the fact he took on a more Hyuran name for the sake of blending in better, but that originally he has a (yet to be determined) Doman name. Well, actually there is a bit more to his story, but I need to flesh it out at some point as it's all still vaguely in my head. It involves a phial of Fantasia and people needing to think his original is dead. :P

[Rokke]

I figured Estinien's is a title in the same vein as Haurchefant "Of the silver fuller" and Aymeric "The Blue".

[Draginhikari]

I named my Au Ra using Yugiri's naming scheme since I determined it before the official Au Ra naming lore was released the reality is it seems like alot of NPCs following this pattern of naming and is not always tied to race lore.

[Dualblade]

It would certainly be a highly unusual name for an Ishgardian if that was Estinien's last name instead of a title.

[Alice_89th]

Greystone is the last name of all Ishgardian bastards (which means it is also the "true" last name of Hilda and Aymeric).

Aymeric his full name is confirmed as Aymeric de Borel in the MSQ of 3.3. At the very least, that is how he introduces himself to Hraesvelgr.

[MiniPrinny]

I named my Au Ra using Yugiri's naming scheme since I determined it before the official Au Ra naming lore was released the reality is it seems like alot of NPCs following this pattern of naming and is not always tied to race lore.

Well, to be fair, the era of Japanese names that Yoshida's team chose for the Raen is very uh... "hippie?" You'll see a lot of names that are compounded terms made into one whole thought when translated properly. To use Sakura as an example, her name while a mouthful, would be the equivalent of "Cherry blossom [from the village where] snow originates."

Aymeric his full name is confirmed as Aymeric de Borel in the MSQ of 3.3. At the very least, that is how he introduces himself to Hraesvelgr.

This is more naming genius. Aymeric, while seemingly made up, actually means a few things, all related to the power of something, since "ric" means power. The former part of his name however can mean either "whole or universal," "work or labour," or "home." de Borel on the other hand, is likely his mother's last name, since it is a trade name referring to weavers, particularly those who work with boure, a sort of reddish brown wool. de Borel helps to cement him as a very humble man who believes in the strength of his nation when it is working as a whole rather than as many fractured pieces.

[TinyRedLeaf]

Well, to be fair, the era of Japanese names that Yoshida's team chose for the Raen is very uh... "hippie?" You'll see a lot of names that are compounded terms made into one whole thought when translated properly.

Most modern Japanese surnames tend to be compound words that refer to places (Yamamoto: "base of the mountain"; Tanaka: "middle of the field", etc), so I'm not sure what's hippie about them.

If we want to be strictly lore-compliant, according to the Raen race-naming convention, only older warrior families had surnames, which tend to be martial in inspiration, eg, 八剣 (Yatsurugi, "Eight blades") and 弓束 (Yuzuka, "Quiver). Since Raen names supposedly draw reference from Tokugawa-era Japan (1600s to 1800s), there are a wealth of samurai surnames a Raen character of noble birth could potentially have. The "plebian" Raen didn't use to have surnames, but they have since adopted family names that refer to traditional professions.

Actually, it now occurs to me why the Doman shinobi have their peculiar naming convention. The ninja are probably drawn from common stock — their original families possibly didn't have any illustrious surnames to begin with. Or, they're possibly outcasts adopted into various shinobi clans (it's not entirely clear to me whether Yugiri and Oboro are from the same ninja village, for example), and are hence given a new name to indicate their induction into a new "family". None of this is official, but it's fun food for thought for the role-playing fans.