I am a historical researcher. I answer questions on French genealogy message boards when I am in mired in difficult research, my head hurts, and my eyes are weak (smile!). -- I have no connections to your research. (My family is from elsewhere in France.)
To answer your questions: Yes, your Boudet family members who were successful traders could have married into a noble family, which could be where they obtained their noble lineage.
On the other hand, do not put too much speculative effort into linking town names to family names. Although some long-shot links happen, I suppose, most chances are as likely as finding the goose's golden egg. More likely, you might find a place name (a square, a mill, a road, etc.) inside a town where an ancestor lived that could tie your family to a place via a notarial record. -- In general, stick to your records at hand and the facts you can verify that directly lead to new facts and new places.
- - - - - - - - - - - - - - -
The history of the sugar and slave trade between Nantes, La Rochelle, and Bordeaux with Cuba and Saint-Domingue (Haïti), to the slave revolts, the revolution, and exodus back to France and New Orleans, fills volumes. It is endlessly fascinating and complex research.
Here are some resources that may help you with your Franco-Cuban research:
IREL ANOM : Archives nationales d'outre-mer (National Overseas Archives of France, in Aix-en-Provence)http://anom.archivesnationales.culture.gouv.fr/
»» This archive has most all of the historical colonial records of France, all periods, all places, including digitized online état-civil (birth, marriage, death records, etc.) for many places & online indexed databases
(When your research is advanced, you will want to visit the Diplomatic Archives in Nantes (CADN) - one of my favorites places to work! :http://www.diplomatie.gouv.fr/fr/le-ministere/archives-et-pa...
Genealogy Forum - Research in Cubahttp://www.genealogyforum.rootsweb.com/gfaol/resource/Hispan...
Saint-Domingue Special Interest Group (SIG) - Augusta Elmwoodhttp://www.agh.qc.ca/fr/documents/sig.html
Peter E. Carr (1991), « Guide to Cuban-American Research: Records and Sources », order: P.O. Box 1125, San Bernardino, CA 92423
»» Explains how to access lesser know Cuban resources in the U.S.
George Ryscamp (1997), « Finding Your Hispanic Roots », Genealogical Publishing Co., Baltimore, MD
Cuban Genealogical Society
P.O. Box 2650
Salt Lake City, UT 82110-2650
Institute of Genealogy and History for Latin America
316 West 500 North
St. George, UT 84770
Telephone: (801) 652-1710
Fax: (801) 674-5787
When you visit La Rochelle, an extremely beautiful historic city on the ocean - worth a trip to France by itself - be sure to visit the Musée du Nouveau Monde - a fine museum that covers everything you are researching!http://www.ville-larochelle.fr/culture-sports-et-loisirs/esp...
I hope this message gives you many ideas and leads you to much success with your research!
Bonne quête !