I was at the library this weekend. I found some mentions of Merrills in a few books and copied them down. Unfortunately, none of the info matched my Merrills but maybe it will match yours.
Source: Connecticut Nutmegger Volume 22 #4, March 1990 Cemetary headstone listings: Gilead Cemetary - Hebron, Connecticut Esther Merrill, wife of John, died Aug 14, 1786, age 73 years. Fowler Merrill, son of John and Sarah, died Jan 7, 1793, age 23 years. John Merrill, died May 6, 1820, age 82 years.
Source: Connecticut Nutmegger Volume 22 #1, June 1989 New London Marriages: Alexander Merrill married Lovina Potter - Jan 1, 1828 Edward Merrill married Mary Darrow, Both of New London, November 6, 1823. John Merrill married Polly Savage - Feb 28, 1827 Joseph Merrill married Abigail Stone, of Guilford, Connecticut, on March 13 1741 in New Hartford, Connecticut.
Source: (copied into the Connecticut Nutmegger Volume 22 #1, June 1989 from)Barbour Collection at Connecticut State Library Town of Wethersfield births: John Olen Merrill, b. Mar 17, 1848, son of William, blacksmith age 27, and Electa, age 22. "Son" b. Jun 11, 1855, to William, mechanic age 33, and Electa age 28.