Gersham Lewis was born 30 December 1704 in Barnstable, Barnstable County, Massachusetts to John Lewis (1666-1738) and Elizabeth Huckins (1671-1741) and died 18 October 1766 Litchfield, Litchfield County, Connecticut of unspecified causes. He married Mary Maltby (1708-1793) 1726 in Guilford, New Haven County, Connecticut.
Children
| Name | Birth | Death | Joined with |
| John Lewis (1736-1758) | |||
| Gershom Lewis (1738-1739) | |||
| Nathaniel Lewis (1740-1817) | 22 October 1740 Guilford, New Haven County, Connecticut | 1817 Blockville, Chautauqua County, New York | Esther Tuttle (1747-1824) |
| Mary Lewis (1742-1823) | |||
| Elizabeth Lewis (1743-1820) | |||
| Osias Lewis (1750-1812) | |||
| Reuben Lewis (1753-1779) | |||
Siblings
| Name | Birth | Death | Joined with |
| Edward Lewis (1697-1747) | |||
| Thankful Lewis (1698-) | |||
| John Lewis (1700-1737) | |||
| Elizabeth Lewis (1701-1769) | |||
| James Lewis (1703-1730) | |||
| Gersham Lewis (1704-1766) | 30 December 1704 Barnstable, Barnstable County, Massachusetts | 18 October 1766 Litchfield, Litchfield County, Connecticut | Mary Maltby (1708-1793) |
| Shubael Lewis (1705-1766) | |||
| John Lewis (1706-) | |||