I've got a few stories because my mom was huge into genealogy.
The first interesting one is two generals from back in Europe. The first one is
Michel Ordener, a French general in Napoleon's Imperial Guard. He commanded the cavalry at Austerlitz that pushed the Russians onto the ice and caused them to drown (they weren't on the ice initially, as the movie suggests). Despite being from common origins, our genealogy showed that he was somehow descended from a Swedish general in the 30 years war, though I can't remember the details on that. Anyway, his descendant (I think grandson), moved to the US in the late 19th Century.
My dad's side, minus this Frenchman, is almost all German, mostly just poor immigrants. My dad's dad's side came from Northern Germany, where they were Catholics in Lower Saxony, which was protestant. They left (presumably for religion, but possibly also due to poverty), spent a generation in Holland, then came to Illinois, coming down to Texas after the Civil War. My dad's mom's side was already in Texas. They came at the very tail end of the republic. They were also Germans, from Westfalia. Our clan on that side is huge and well-organized. Somehow, my ancestor's house survived and is now the home of the
"Texas Polka Lovers Museum." Although it's been relocated to the Czech Heritage and Cultural Center in La Grange, my ancestor was German, not Czech. Whether he loved Polka or not, who knows. He probably didn't look up from a plow too much all his life.
My mom's side is mostly English. They were also Catholic and in their case almost certainly fled for that reason, settling in Maryland, which tolerated them because Lord Baltimore was pretty enlightened. One ancestor was an officer at the Battle of Yorktown (on the good side). That he was there is awesome, that he was an officer is particularly amazing. But whatever wealth our standing he had didn't pass down by the time the family came to Texas in 1824 and settled here. Because my family has been here for 200 years, I can say with truth that my family has lived in Texas longer than the Comanches did. There are some characters in mom's side. One was a pretty successful rancher South of San Antonio in Wilson County. One was actually a woman who ran a ranch after her husband died and had good success at it.
There are other ancestors of interest, but I don't really claim them too much because they're not on the main line. We've got Francis Scott Key in there, somewhere, and one of the early Apollo astronauts is a cousin of some kind.