Adam Metrash is listed in the 1850 census. In the Ancestry.com index Metrash is listed as Mcnash. There is no dollar value in the "Value of Real Estate" column by his name. This could indicate that he did not own the property on which he lived.
The current location of the property is the southeast corner of Smith Street and Moody's Lane. There has been a lot of construction in that area.
Some of the Metrashes are buried in St. Paul's Cemetery at the corner of Rt. 1 and East Avenue in Norwalk. St. Paul's is an Episcopal church.
In a listing from the church copied in January, 1935:
Metrash, Phillis, wife of Alvin, died July 24, 1805, age 39 years.
Metrash, Alvin, son of Adam H. & Ruannah, died July 8, 1845, age 3 mos.
Metrash, Alvin, died June 30, 1829, age 67 yrs. 7 mos. 6 days.
From the book "Norwalk Cemeteries" by Lester Card:
Metrash, Jennie, died 9/17/1857, aged 78 years.
I found the following unsubstantiated statement on a web site no longer on the web:
In Connecticut, specific names of some of the African Americans who served in the Revolutionary War include: Seimus Carr of Bridgeport, John D. Parker, Adam Metrash, and William Purdy of New Haven. There were FPOC in Norwalk with the surnames of Parker, Purdy, and Metrash.
So there is the possiblity your line goes:
Adam, Alvin, Adam H., Adam H., Robert L. G.
Judy Cobin, Norwalk, Connecticut