The DERRY line I am actively researching is from Germany, but I have accumulated other DERRY information along the way.
There is a family tree on Ancestry.com that gives HARRY L. DERRY's parents as SAMUEL DERRY (1835) and ELIZABETH SNAITH (1832) from Nottinghamshire. However, it shows son, HARRY, still in England in the 1891 and 1901 Census whereas his emigration is listed in the PA Census as 1885/1886 with naturalization in 1891. Therefore, he could not have still been in England. The URL is:
http://trees.ancestry.com/pt/person.aspx?pid=-853231089&...=
If you could find the marriage record for HARRY and DELIA it would provide her maiden name and help you locate her parents in Kentucky.
Good Luck!
Joan Brown Derry
MDMama2841@aol.com