I think one should look at the purpose of Wiki Tree and the Purpose of the "Name" Fields. (By the way, the current Wiki Tree search engines need a little work because Maria Eligia and Maria Luisa are in no way a possible match - exact dates, locations, and parental info is/was listed for both profiles).
I am currently working on the Seminole Nation/Tribe. I have already made profiles for two of their leaders that do not have a "surname" or "LNAB". The first "recorded" leader of the new Seminole Nation was Chief "Ahaya". His "Nickname" or "English name" was Chief Cowkeeper. So, since Wiki Tree uses an "American" (or "Western") Naming system, I applied this system in the following way: On the Internet one can Google Ahaya and the first search result is Ahaya - Wikipedia, the free encyclopedia. In the LNAB, I used his English name, Cowkeeper. If one types in Cowkeeper in Google search, the same result comes up. To use the tribe name Seminole would not be correct since Ahaya was from the Oconee (Okone) Tribe (of the Creek Nation) of Georgia. The Seminoles also co-existed and intermarried with other Tribes and people such as Africans, the Yamasee, Appalachicola, Creeks, etc.
Ahaya's nephew (or son), Payne, became the leader after Cowkeeper's death. I listed his Proper First Name as "King" and his LNAB as Payne. On the Internet and in literature found on the Internet, "Payne" is either listed as "Payne" or "King Payne". I do know that some of the Seminoles used "Payne" as a formal last name and this knowledge helped me to decide how to list "King Payne" on Wiki Tree. (I also did a Wiki Tree Search before I added "King Payne".
I have the "muster" rolls of when the Seminoles were relocated to Indian Territory and I am in the process of matching people from the muster rolls to United States Census Records to see these Native Americans (and/or descendents) were listed on records before I add them. Some of the Seminoles used their "Band" (or "Clan") name as a formal last name - Bowlegs, Harjo, Payne (pa ya han), Warrior and some used their "position" as a surname. I may/may not have Seminole DNA so I am reading about Clans, Bands, and their social structure.
I am not quite so sure what to do about the ones that did not make it to Indian Territory - I think for those that were "slaves" I will use their owner's name (or band name) and in the case of Orphans - I will use their tribe name if I cannot find anything else. Of course, listing the naming conventions NA names, English Name, Christian Name, and Nickname info are all listed in the Bio.
I do agree that there should be a standard - I think the standard should be to use whatever their descendants or history books "know" them as - if not known in history books then their "Clan" or "Band" name should be used. I think the "Tribal Name" should be used as a last resort