A word for humans, nations, and kin
In everyday English, people names human beings in a loose group: strangers on a street, the citizens of a country, or the relatives someone calls my people. It also stands, in ordinary speech, as the usual plural of person. That range is not a native Old English inheritance. It belongs to a Romance loan that slowly took over jobs once done by several Germanic words.
What can be said with confidence about the origin of the word people is the French and Latin path, not the Italic prehistory. The last step before Latin remains a matter of disagreement among specialists.
From Anglo-French into Middle English
English took the form from Anglo-Norman spellings such as peple, pople, and people, themselves from Old French pople, pueple, and peuple. In French the word already covered the inhabitants of a country, a crowd, a ruler's subjects, and humankind at large. An early Old French shape poblo is recorded in the ninth century, with poble around the year 1000. By the twelfth and thirteenth centuries the senses included subjects, humanity, and the common ranks as opposed to nobles.
On the English side, the earliest firm evidence falls in Middle English, before 1300. Other dictionaries round the date to about 1300 and list spellings such as peple, puple, and peeple. After the Norman Conquest, Anglo-Norman vocabulary for social groups and government settled into English, and this noun was one of the durable arrivals.
A verb followed in the mid-fifteenth century: to people a land, meaning to fill it with inhabitants. That verb tracks the English noun, or else French peupler, and it survives in peopled and peopling.
Latin populus, and a root that will not sit still
Behind French peuple stands Latin populus: a nation, a civic body, a multitude. In Rome the word named the citizen body that could act in law and politics, not only a shapeless crowd. Later Latin stretched it to congregations, the laity, and, in some medieval uses, an army.
The deeper history of populus is disputed. Early Latin shows poplus and poplos before the familiar classical shape. Some specialists reconstruct a Proto-Italic form meaning army, a reading supported by related Italic material and by Latin populari, to ravage, as if that were an army's work. A cult epithet of Juno, Populonia, has been read along the same lines, as a protector against devastation. Other accounts treat the Latin as a reduplicated form of uncertain origin. An Etruscan source has long been proposed; at least one major American dictionary still presents that as the etymology, while others leave the question open or prefer the army reconstruction. A link to the root of Latin pleo, to fill, and of plebs has also been floated and remains unproven. Honest accounts stop there.
What is settled is the Romance family. Spanish pueblo, Italian popolo, Portuguese povo, Catalan poble, and Occitan pòble are siblings. English pueblo, taken later from Spanish, is a doublet of people: two descendants of the same Latin noun, arriving by different routes and now naming different things.
What English already had
Old English did not lack words for a nation or a body of humans. Folc, later folk, was common, including in compounds for meetings and public speech. Þeod meant a people or nation and belongs to a wide Germanic set of words for a tribe. It lived on in Middle English as thede, in the phrase in thede, and in place-names such as Thetford. Leode, Middle English lede, could mean persons, a nation, or retainers. Over the later Middle Ages, the French loan took over most of those jobs. Folk never vanished, but it narrowed, and in the nineteenth century it gained a fresh adjective life in folklore. Thede and lede largely left ordinary speech.
The grammar of the new noun may show that native pressure. Early English often treated people as a collective that could take a singular verb. Later usage treats it as a plural for persons, a shift that some etymologists connect with the old plural leode. In legal and official English, persons still appears where a numbered set of individuals is meant. Everywhere else, people won.
Person itself is a different Latin word, persona, an actor's mask and then a character. The two English nouns look like a pair, but they are not kin. The modern habit of using people as the plural of person is a later English arrangement, not a shared root.
Senses that piled up
From the start, the loan could mean humans in general and some unspecified persons. By the late thirteenth century it also named the commons as opposed to the nobility, a social contrast already present in French. By the mid-fourteenth century it could mean the body of a community. By the late fourteenth, it could mean one's family, clan, or tribe.
A political sense followed much later: the whole body of citizens as the source of public power, recorded from the seventeenth century, and visible in American legal captions that pit The People against a defendant from the early nineteenth. In the twentieth century, some states used the word in official titles in a way critics treated as a claim to speak for everyone. A separate rendering, People of the Book, appears in the nineteenth century for communities with a revealed scripture, after Arabic Ahl al-Kitab.
None of these layers cancelled the others. English still uses one form for a crowd of strangers, a nation, and, in the plural peoples, several nations. It still names ordinary citizens against an elite, and the relatives someone belongs to.
Related English vocabulary keeps the Latin stem in view: popular, populate, population, populace, populous. Those words arrived through learned or French channels and sit beside the everyday noun rather than explaining it. The everyday noun is the older popular loan, worn down in sound and spelling until it no longer looks like populus.
A name on the map
If the Latin origin stays cloudy, the English landscape is not. The first element of Thetford still preserves þeod, the native noun that the French loan replaced in ordinary speech. The Romance word did the everyday work; the older Germanic word kept a foothold in a place-name. That split is a fair emblem of the history: a French civic word became the default English noun for human groups, while the older vocabulary survived at the edges, in folk, in legal persons, and in a few names on the map.