Not a mystery, and not one tribe
Two corrections belong at the start. First, the origins of Apache peoples are a subject of active study, with a well-supported framework behind them, not an unsolved puzzle. Second, “the Apache” are not a single tribe. They are several nations, among them the Western Apache groups, Chiricahua, Mescalero, Jicarilla, Lipan and Plains Apache, each with a distinct history. The framework discussed here comes mostly from linguistics, and it applies to all of them as a family of related languages, not as a claim that they are one people.
What the Athabaskan family is
Linguists use “Athabaskan” (also spelled Athabascan) for a large family of related languages. In northern Canada and Alaska many of these languages use the root word “Dene”, or a close form of it, in their own names for themselves, which is why the family is sometimes called Dene. Examples of northern languages include Gwich’in, Dene Suline and Dena’ina, and the Northern Athabaskan peoples who speak them live across an enormous territory.
The family has three main parts. The first is the northern branch just described. The second is a smaller set of languages along the Pacific Coast of Oregon and northern California, such as Hupa and Tolowa, discussed in studies of Pacific Coast Athabaskan. The third is the southern branch, often called Apachean, spoken in the American Southwest and southern Plains. It includes Navajo and all the Apache languages.
How the argument works
Linguists compare words and grammar across languages to find regular patterns. When two languages share many words whose sounds correspond in consistent ways, the most economical explanation is that both descend from a common ancestor. Chance resemblances do not produce such regular patterns across a whole vocabulary. Athabaskan languages also share a distinctive structure, with complex verbs that carry much of the meaning in a word that can look like a whole sentence in English.
This kind of comparison has been used for well over a century, and the relationship between northern, Pacific Coast and southern Athabaskan languages is widely accepted. The consequence is that the ancestors of the Apache-speaking peoples, at some earlier time, lived in or near the region where the family began. Most scholars place the family’s older homeland in the north-west of North America. Where exactly, and when the southward movement began, is debated.
What the evidence does not tell us
Language shows relationship, but not routes, dates or the detail of life. It cannot say whether people travelled in a single wave or in many small movements, whether they followed the Plains or the mountain west, or how much they mixed with other groups on the way. It also says nothing on its own about the cultures that developed later. The cultures of Apache nations grew over many generations in new landscapes and through contact with neighbours, so they cannot be read directly from northern ones.
For timing, linguists sometimes estimate how long languages take to diverge, but these methods rest on assumptions and give wide ranges. Estimates of the age of the Southern Athabaskan group therefore vary, and a responsible account cites a range, not one figure. Archaeology and Spanish records can narrow the picture a little for the last few centuries before European contact, and the two kinds of evidence are best read together.
A wider hypothesis
Some linguists have proposed that the Athabaskan family is distantly related to the Yeniseian languages of Siberia. This is called the Dene-Yeniseian hypothesis. It attracted considerable attention, and some scholars find it persuasive, while others remain cautious. For the question of Apache origins, it adds a possible deeper layer but does not change the main argument, which is the relationship inside the Athabaskan family itself.
Names for the people
Many Apache and Navajo groups use names for themselves that are related words in the family, something like “the people”. The Nde self-name, in its various forms, is an example in Apache languages. “Apache” itself is not a name the nations originally used for themselves as a whole, and its history is treated elsewhere. Using the group’s own name where it is known is the more respectful approach.
Languages today
The Apache languages are still spoken today, though the number of speakers varies by language and community, and several are considered endangered. Readers will find that the Apache languages and dialects form a related set with real differences between them, such as differences in sound and vocabulary. Anyone wanting current information on language programmes should check the nations’ own official websites, since situations change.
The takeaway
The Athabaskan language family is the central evidence for Apache origins because it ties Apache languages to relatives far to the north, and it explains a good deal about how the family spread. It does not make the Apache a single tribe, and it leaves the timing open. Scholars continue to refine the picture, and oral traditions held by Apache nations offer their own accounts alongside it.