Many thanks for replying so promptly.The information you provided is much appreciated. I note your comments regarding English/Irish roots.
A number of my deceased relatives are buried at Derriaghy Parish Church near Lisburn, Co Antrim.The oldest grave which I can find is that of my grandfather Robert Elwood.The oldest record of the name which I can find is contained in the report of aVestry Meeting at Derriaghy Parish Church on April 19, 1731, where mention is made in the Vestry notes of one Wm Ellwood (yes two LL's)! The notes are signed by Rev John Gayer, Vicar of Derriaghy from 1707 - 1737.
Mention has been made in the Forum Postings of Family Names handed down over the generations.My grandfather Robert and his wife Mary Ellen nee Bradshaw had seven sons named - William, James, Robert, Norman, Andrew, Carson and Albert George (my late father).These names continue in subsequent generations (including Bobs and Bills) !In addition my grandfather Robert had a brother William.
I recall my father saying approximately 50 years ago that the immigration of Elwoods probably to New York had been talked about.Other families in the immediate neighbourhood who immigrated were called Crowe and probably Bradshaw.
The common local viewpoint is that the Elwoods came from England during the Plantation of Ulster. The family crest, which I have, depicts a lion (top section) with an ermine (lower section) the motto is "Fide et Sedulitate".Obviously I need to do a lot of research and will be pleased to keep you posted of any developments.