I have been told by a family source that Edmund's family may have originally come from "the foot of the Stack Mountains", settling at the Hill in Gortdromasillihy, Newtownsandes (renamed Moyvane in 1939), where the land was better. Accoring to this source, the Hill was the name given to the property owned by Edmund's family, mainly in order to distinguish it from the properties of at least two other Stack families in the townland of Gortdromasillihy.
It has been suggested that Edmund was the Edmund (known as Ned) Stack from Gortdromasillihy who was born around 1807 and who married a Mary Connor and who also lived in Gortdromasillihy around the same time. However it seems they were not the same person as, although both had a daughter named Mary, the daughter of Edmund above married a Dan Kennelly (father was Jeremiah Kennelly) in 1879 and Ned's daughter married a John Kennelly in 1866 (father was Denis Kennelly). Edmund above and Ned could of course be related but I have no evidence so far to link them.
In case you might be wondering, the well-known jockey, Tommy Stack, from Moyvane, who rode Red Rum to victory in the 1977 Aintree Grand National, is NOT, I am told, a descendant of either Edmund.
The Stack surname is common throughout Ireland, especially in Munster where the strongest concentration is in north Kerry. It is a Norman name and originally had a 'de' prefix - 'de Stac', 'de Stak', etc. The Norman Stacks settled in the Abbeydorney / Kilflynn area, building a residence nearby in Crotta in 1320 and giving the name Stackstown to Kilflynn. The mountains between Tralee and Lyrecrompane became the Stack Mountains, and the whole area was named Pobal Stack (Stacks' Country). One member of the clan, Maurice Stack, born in 1499, became bishop of Kerry and carried out major improvements to Ardfert Cathedral where he is buried. By the 16th century, the Stacks were adversaries of the English, and fought on the Irish side at Kinsale in 1601.
Note from Helen: Although neither my husband nor I am descended from Edmund Stack above, Edmund's son Tom married my great-great-aunt Ellie Shanahan. In the course of my research into the Shanahans I was given much valuable information on the Stack family which I have included in the website. I hope it is useful to Stack researchers.