One of the women that married into your Jacot line may have been Spanish, so don't rule that out. Jot that little tid bit down so if you don't find anything, maybe someone else down the line may. Just remember to say it was a "family thought" not fact from a document. If you remember to keep the two separate you will be more successful in your search. Those family tales should be your starting point and cherished, but back them up with the vital and census records. And don't forget newspapers.