Research Guide

Tracing Your Cajun and Acadian Roots Back to France

By François · Racines Genealogy · Published July 18, 2026

If your family is Cajun, your genealogy is unlike almost any other in America. It doesn't cross the Atlantic once. It crosses it twice. Your ancestors left the villages of western France in the 1600s, built a world called Acadia on the shores of what is now Nova Scotia, were torn from it in 1755 in the deportation the Acadians call the Grand Dérangement, and after years of exile found their way to the bayous of Louisiana, where "Acadian" softened into "Cajun."

Tracing that story means a journey in three legs: from Louisiana back to Acadia, across the deportation; from Acadia back through its registers to the founding families; and finally, the leg where most researchers stall, from Acadia back to the precise villages of France. Here is how each leg works, and the good news hiding in the hard parts.

First, the remarkable good news

Acadian genealogy is one of the best-documented in North America. The entire Cajun people descends from a surprisingly small number of founding families, a few dozen surnames: Boudrot (Boudreaux), Thibodeau (Thibodaux), LeBlanc, Broussard, Hébert, Landry, Doucet, Aucoin, Comeaux, Babineaux and their companions. Because the community was compact and intermarried, generations of scholars have reconstructed it family by family. If your line is Acadian, the middle of your tree has, in a real sense, already been built. Your work is to connect yourself to it at one end, and to connect it to France at the other.

Leg one: Louisiana back to the deportation

Your first task is to climb from your family to the ancestor who arrived in Louisiana; most Acadian arrivals fall between 1764 and 1785. Louisiana's Catholic records are the backbone here: the sacramental registers of the dioceses (Baton Rouge, Lafayette, New Orleans) have been abstracted and published in multi-volume series that cover baptisms, marriages and burials back into the 18th century. Spanish colonial censuses of Louisiana pick up the Acadian settlements almost as soon as they formed.

One arrival deserves special mention: in 1785, seven ships carried some 1,600 Acadians from France to New Orleans, families who had spent up to thirty years in French exile after the deportation. The passenger lists of the Seven Ships survive, family by family. If your ancestor is on one of them, you've just been handed a bridge across two legs at once, because their exile years generated French records, as we'll see below.

Leg two: Acadia itself

Acadia (1604–1755) kept the records a French colony would: parish registers at Port-Royal, Grand-Pré and the other settlements, plus a series of censuses (1671, 1686, 1714 among others) that list families, ages, livestock and land. Many registers were lost in the upheaval, but scholarship has filled the gaps to a degree that astonishes newcomers. The gold standard is Stephen A. White's Dictionnaire généalogique des familles acadiennes, which reconstructs the genealogy of virtually every Acadian family from the founding through the mid-1700s with documentary rigor. If you connect your Louisiana line to a family in the DGFA, your Acadian generations are established on solid ground.

Leg three: crossing back to France

Now the hard, beautiful part. The Acadian founders came largely from western France: Poitou, Aunis, Saintonge, the hinterland of the port of La Rochelle, although twenty-four French provinces are represented by at least one colonist. The familiar attribution is to the Loudun area of Poitou, around villages like La Chaussée and Martaizé. That attribution rests on a linguistic hypothesis rather than on French archival proof, and it is contested; the three crossings sets out the state of the question. For others, research in French notarial and parish records continues to yield discoveries, and this is precisely where reading 17th-century French handwriting, and knowing the archives of Vienne, Charente-Maritime and their neighbors, makes the difference.

The forgotten French chapter

Here is the angle most American researchers never use. After the deportation, thousands of Acadians spent years, often decades, in France itself: in Saint-Malo, Cherbourg, Nantes, La Rochelle, on Belle-Île-en-Mer, and in the failed farming colony of the "Grande Ligne" in Poitou. They married, baptized children and buried loved ones in French parishes, appeared before French notaries, and drew government pensions that generated meticulous rolls. All of that paper sits in French archives, much of it digitized. For the families of the Seven Ships especially, there is often a twenty- or thirty-year French paper trail between Acadia and Louisiana: records that name birthplaces, parents, and home parishes, written at a time when the family's Acadian memory was still fresh. It is some of the richest and least-exploited material in all of Cajun genealogy.

Names that shift shape

Expect your surname to change spelling at every border. Boudrot became Boudreaux, Thibodeau became Thibodaux, Comeau gained an x, and French clerks, Spanish officials and American census takers each heard the names through their own ears. Search phonetically, and treat spelling as a costume, not an identity. Watch too for dit names, the alias tradition (Jean Roy dit Laliberté) that can make one family look like two.

What this means for your research

A realistic Cajun research project looks like this: establish your line from today back to the Louisiana arrival with sacramental and census records; connect it to the reconstructed Acadian genealogy and verify against the scholarship rather than copied trees; then attack the French side, the exile records first if your family passed through France, the western-France archives for the founding origin. The first two legs are demanding but well-charted. The third is where original discoveries still wait to be made: in French, in old script, in archives organized the French way.

François is a French-born genealogist living in the United States. Where to go next: Where to go next: where the deportation scattered the families, and which records follow them · the three crossings, from Louisiana back to Acadia and to France · which French provinces the Acadians actually came from · what an Acadian surname can and cannot tell you · how to find the French village your ancestor came from · French-Canadian ancestry back to France, if the line turns out to run through Québec rather than Acadia · how to find your French grandparents, if the family left France within living memory. New to French research altogether? Start with the complete guide to tracing your French ancestry, and see the method applied to one real family, traced from New Jersey to two Alsatian villages.