Benjamin Merrill was born on 11 December 1759, in Hopewell Township, Hunterdon, New Jersey, United States. He married Mary Baker "Polly" Hart on 11 January 1789, in Hopewell, Mercer, New Jersey, United States. They were the parents of at least 2 sons and 3 daughters.
Welsh and English: from a female personal name of Celtic origin, found in Welsh as Meriel and Meryl and in Irish as Muirgheal, earlier Muirgel (‘sea-bright’).
English: habitational name from one or more of the many places whose names derive from Middle English mirie, merie, murie ‘merry, pleasant’ (Old English myrge) + hill, hell, hull ‘hill’ (Old English hyll), including two places called Merry Hill in Staffordshire and a third in Hertfordshire.