In 1835, a Hartley CUNNINGHAM & Abigail SIAS marry in Charlestown/Boston, MA.  Surely there is some kind of connection here. 

1.  Oliver Ayer Roberts.  1901.  History of the Military Company of Massachusetts.  Vol. 4, 1866-1888.  Alfred Mudge & Son, Boston, MA (online at Ancestry.com).  On p. 12:

Samuel S. Sias (1866), treasurer of the Boston Electric Light Company, of Cambridge, son of William and Chloe B. (Hall) Sias, and brother of William W. Sias (1883), was born, May 2, 1843, in Montpelier, Vt.  He married, June 21, 1865, Harriet E. Cunningham, of Boston. He spent his first ten years in Vermont; since which time he has lived in Cambridge, where he received his education.  He was a clerk in mercantile business until 1862, when he engaged in the tea business,-– firm name, Sias, Bracket & Co.; also the iron business until 1881, at which time he entered upon his present position,–treasurer of the Boston Electric Light Company, No. 74 Ames Building, Boston.

This account was almost surely written by Samuel, himself, and he should surely knew where he was born; yet, the 1840 and 1850 censuses both show his parents living in Danville, Caledonia Co., VT, and Samuel was with them in Danville in 1850.