The names of the sons are readily found. Did Harvey and Cathrine have daughters?
Greetings, Harvey HAY and Catherine FERGUS did indeed have daughters. But to be sure you have names of all their children, here they are:
(1st) Edward HAY (1765/6 - 1826) NOT born 1761 as stated by many; parents married 26/01/1765St Mary's Chapel, Liffey Street, Dublin. Descent to me.
(2nd) Philip HAY (1773 - 1856); Light Dragoons; retired as Lt Gen; descent
(3rd) James HAY (pot-1774 - 1796); Capt The Buffs died St Lucia, West Indies
(4th) John HAY (1776 - 1798); Lt Irish Bde / Dillon's Regt with French army 1782-1798; descent daughter Mary Catherine ( 1796; d 1865 Midleton, Co Cork; married 1821 Francis WYSE (1796-1855) at Holy Trinity (RC) Waterford.
(5th) Hannah HAY (pre-1779 - post-1810); married Laurence CLINCH c1795; descent 3 x daughter, 1 x son all born Enniscorthy; John is only one with descent 4 x children born Howth, Co Dublin
(6th) Mary HAY (c1781 - pre-1806); married Alexander GRAYDON; no descent
Hope this helps.