My grandmother's people were Black Dutch, which probably had as much to do with having a lot of Native American blood as anything else. However, they were also mixed with French Huguenots (Maupin) who were driven out of France, settled temporarily in Holland, then went on to England, then to America from there to start an early Huguenot settlement in Virginia. The Dutch reference may have come from the stopover in Holland, but there wasn't any real reason for the Black Dutch or Black Irish reference except to explain dark Indian features which were looked down on back then.
That's interesting. I'm familiar with the Maupin family; some of them married into my family early on. Black Dutch tends to mean that people have NA blood. It became a euphemism at a time when it was not politically and socially correct to have mixed blood. My mom owns a vacation trailer on land that is owned by a Maupin family. And I remember Maupin's store from my college days...
"from there to start an early Huguenot settlement in Virginia"
Probably Manakin Towne... modern-day Richmond. I've got a few Huguenot names in my lines too, Faure/Foree/Ford and others.