Ken, thanks for your information. There are lots different Demar lines, obviously.
My particular ancestor was Thomas Demar who arrived in St.Mary's County, Maryland from France, prior to 1632 (from microfilm). I also have a 1696 final account and a 1717 inventory for his son.
As to our spelling, my grandfather added an R in the late 1800s when a couple of cousins did also. I have our descendants pretty well documented.
Thanks
Margaret