Near to where I live there are similar people who live in a village called Hillburn and up in the Ramapo Mountains. They are a mixture of old Dutch, black slaves, and Indians. Many of them have Dutch surnames, like Van Dunk or DeFreese. Went to school with quite a few of them.
Lately, they been trying to form a casino by claiming they are a legitimate Indian tribe - the Ramapoughs.
There are a number of tri-racial groups. The Ramapos are one of them. There are some in NC who are not Melungeons and there are some out of Louisiana. Heather Locklear is a descendent of the NC group and I have read that Steve Martin is a descendent of the LA group. I forget their names. Apparently Locklear is a common name in her group and she has publicly said that she is a descendent.
Holy cow ! Don't let the good citizens of Pella, Iowa find out about this.