William Hay (d. 1812) married Sarah Atkinson and they had a son John Duffield Hay (1775-1844). John D. Hay married and had three children: Mary Ann (b. 1815), Nancy Ann (b. 1817) and George Duffield Hay (1820-1895). Henry Gurley Hay (1847-1919) the son of George D. Hay and Harriet H. Axtell, moved to Cheyenne, Wyoming in 1870 and became Assistant Surveyor General of Wyoming Territory. He married Ella O. Bullock in 1874 and they had two children: Henry G. Hay Jr. and Mildred Hay Gibbs. Ella Hay died in 1895 and Henry G. Hay Sr. remarried in 1903 to Mary Abbott Seabolt, who died in 1907.
Henry G. Hay Sr. was engaged in cattle and sheep ranching, wholesale grocery and banking. He was also a member of the Wyoming Constitutional convention in 1889 and State Treasurer from 1894-1898 and 1902-1903. From 1903 until his death in 1919, he served with the United States Steel Corporation. Henry G. Hay Jr. (1876-1959), a banker, was born in Cheyenne, Wyoming and married Bessie Robbins in 1897. Henry and Bessie had two children, Henry G. Hay III and Helen Hay Pierrot. Henry G. Hay III, born in 1900, was married to Anna Curran and served with several financial companies in Gary, Indiana, before being recalled into the Army from 1942-1946. After 1948 he was a realtor in Denver.
From the description of Hay family papers, 1799-1978 (bulk 1892-1945) (University of Wyoming, American Heritage Center). WorldCat record id: 27705057
