I have gathered a lot of early DENNIS records from various places in Rhode
Island.  I'd like to share what I have in hopes that another DENNIS family
member/researcher may find a "connection.

Records from PROVIDENCE COUNTY....MARRIAGES OF THAT CITY ( pre 1850)

Dennis, Darius L. and Abby J Bullock m by Rev William S Balch, April 2, 1840

Mary Pond Dennis , Alfred Garfiled, Sept 28, 1843

Caroline B Dennis, and Watson D Hatch  1843

William Dennis and Sarah Davis: m. by Rev. James A Mackensie, Aug, 10, 1845

Elizabeth H Dennis and Joseph B Fitz, Feb 22, 1849

Hugh Dennis, of James and Catherine, and Bridget Devlin, of Patrick and Sarah;
m by Rev William Wiley, June 10 1849

Charles R Dennis, of Capt J.R., dec, and Olive Jane Winch; m by Rev Henry
Bacon, Oct 9, 1849

LITTLE COMPTON RI, intentions and marriages....1700,s Dennis, Robert and Susanna Briggs; m by Joseph Church, Justice, Jan 22, 1700 Dennis, Comfort, and Phillip Taylor, June 9 1723 Dennis, John of Triverton, and Hannah Wilbor, of Little Compton; m by Thomas Church, Justice, int. Dec 4 1731; m Jan 6 1732 Dennis, Lydia and Simeon Palmer; int. Aug 10; m 25, 1745 Dennis, Deborah, and Paul Brownell: int. Jan 4, m --, 6, 1746 Dennis, Robert, and Jemina Hilliard' m by Rev Jonathan Ellis, Jan 2, 1755 Dennis, Thomas, and Hannah Wilcox, both of Dartmouth; m by Nathaniel Soul, Justice, Jan 22, 1756 Dennis, Jerusha and John Woodman abt 1767 Dennis, Richard of John and Hannah, and Abigail Simmons, of Benjamin and Mercy' m by Rev Jonathan Ellis, May 7, 1780 Dennis, Thomas and Lydia Crandall, both of Triverton; m by Rev Jonathan Ellis, Sept 10, 1780 FROM LITTLE COMPTON, RI, BIRTHS/DEATHS....these look like death dates to me, since they are so early. I'm just typing them as they appear on the pages I was sent. Dennis, Robert___,____, 1678 Dennis(Briggs), his wife, April 9, 1681 Dennis, Comfort of Robert and Susanna March 12, 1703 Dennis, Anna .........July 3, 1704 Dennis, John.........June 24, 1706 Dennis, Thomas.....___,___, 1708 Dennis, Tabitha........___,___, 1710 Dennis, Sarah.....___<____1712 Dennis, Ellis......__,__ 1714 Dennis, Deborah...___,___ 1716 Dennis, Lydia..... ___,___1718 >>>>>>>>>>the above look like they could be births, but not sure>>>> Dennis, John, June 24, 1706 Hannah (Wilbore), his wife, Feb 9, 1709 Dennis, Robert, of John and Hannah....Dec 14, 1732 <<<<<<>>>>>> Dennis, Thomas...Nov 9, 1734 Dennis, Susanna....Jan 29 1737 Dennis, Humphrey....Oct 8, 1739 Dennis, Shadrach....Feb. 29, 1743 Dennis, Jerusha....Mar 17, 1747 Dennis, Samuel....___,___1749 Dennis, Redford...___,___1751 Dennis, Lucy....___,___1753 Dennis, Marcy, of Abraham and Rebecca,.....Aug 10 1739 Dennis, Abraham......Aug 12, 1751 .................the above from Newport Births and deaths.......................... ............below from Portsmouth Births and Deaths................................... Dennis, Joseph of George and Hannah.....26th 9m, 1791 Dennis, Amey...............29th 9 mo 1795 Dennis, Nathan.....26th 3 m, 1798 Dennis, Nathan.....d Dec 7, 1869 Dennis, Dorcas...23d 7 m, 1802 Dennis, Job Shearman, of Moses and Abigail....30th 8m, 1800 Dennis, Hannah Coggeshall....30th 8m 1800 Dennis, Rowland Hazard.....15th 5m 1804
Source: RI Vital Records, VOL II, Births 1590-1930 from the Newport Common Burial Ground Inscriptions Dennis, Ezekiel d 8 Oct 1753 in 46y (cyb 1708) Grace, wife of Ezekiel...no stone Knoulton, son of Esekiel and Grace Dennis d July 29 1732 age 8d Dennis, Capt John, sailed from this place 22 Aug 1756: never since heard from , in 42 y (cyb 1715) Dennis, Johanna, wife of Capt John, d 22 May 1765 in 45 yr (cyb 1721) on same stone as Capt John Dennis, John of Capt John and Johanna d 24 june 1744 age 11m 16d Dennis, Mary, dau of Capt John Dennis and sift of Capt Thomas Forrester d 4 mar 1796 in 54y (cyb 1743) Dennis, Capt john, no stone Dennis, Catharine Engs, widow of Capt John Dennis and dau of William and Abaigal Engs, b 1 Oct 1783, d 3 Nov 1860 Dennis, Sarah dau of John and Catharine d 15 Nov 1821 age 18 mo Dennis, Kitty T of John and Catharine Engs Dennis b 27 Oct 1813, d 23 Dec 1891 Dennis, John Gamhiell 1860-1934 Jessie Ritchie, his wife 1865-1912 Kenneth R Dennis ( prob son of above) 1896-____ George Ritchie Dennis, so of John and Jessie 15 Mar-2 June 1895 Baby Dennis 6 April 1896....next to George Ritchie Dennis, with a matching stone Dennis, mary A. d 15, )ct 1828 age 18m 7d, buried near Capt Peter Dennis b 1790 & William Dennis b 1796 Dennis, Judge Robert b 22 Mar 1788, d 16 May 1867 Mary Lawton, his wife b 22 Aug 1794, d 27 Sept 1876 Dennis, mary R (possible dau of above) b 18 April 1814, d 10 Mar 1866 Dennis, Capt Thomas, lost at sea 1863 ( cyb ca 1790) Margaret Feke Manwaring, wife of Capt Thomas Dennis d 1 Oct 1864 age 70 (cyb 1794) (Dennis) Capt William Finchton?, son of Capt Thomas and Margaret French ( looks like) Dennis d 1868 age -y Mary Carherine Taylor, dau of Capt Thoms and Margaret French ( looks like) Dennis b 30 Jan 1828, d 22 april 1901 Immediately below Mary Catherine Taylor on the same side of the Moument is (her son?) William H>F>D> Taylor b 1868 and his wife Dennis,Capt William d 9 Sept 1843 age 93y (cyb 1750) Amy, wife of Capt William Dennis and dau og Joseph Nichols d 23 Sept 1826 in 69 y ( cyb 1758) Dennis, Fannie ( possibel dau of Capt William and Amy Dennis & wife of Elnathan Tyler d 31 oct 1858 in 79 yr (cyb 1780) Dennis, Mary dau of William and Ammy Dennis & wife of Fitzjerold Slocum d 5 Dec 1837 in 60y 9cyb 1778) Dennis, William d 5 Fev 1826 age 48 (cyb 1778) Dennis William L d 9 July 1874 age 63 (cyb 1811) Eliza, wife of William L Dennis d 17 Nov 1878 in 63 yr (cyb 1816) This completes page 132 and 133 of the Common Burial Ground of Newport RI
From Tiverton RI, Births & Deaths Dennis, humphrey, of Robert and Susanna....May 12, 1708 Dennis, Thomas...Mar 17, 1710 Dennis, Tabitha....Sept 3, 1712 Dennis, Sarah....Nov 2, 1716 Dennis, Lydia....Feb 18, 1718 Dennis, Elizabeth...Feb 18 1718 Dennis, Deborah of Robert and Susanna...mar 21 1721-2 Dennis, Mary....Nov 3, 1723 Dennis, Obediah of Tabitha,... Dec 7 1731 Dennis, John of Robert and Joanna....Jan 7 1756 Dennis, Hannah...July 29, 1757 Dennis, Oliver Hillard....Feb 29,1760 Dennis, John 2nd....April 16, 1767 Dennis, Susannah....April 28, 1771 Dennis, Thomas, of Obediah and Ruth....June 6, 1757 Dennis, Susannah....Feb 5, 1759 Dennis, Mary...May 8 1761 Dennis, Hannah....Oct 24, 1763 Dennis, Sarah...Nov 27, 1764 Dennis, Joseph...Nov 5 1766 Dennis, Robert...Dec 12, 1768 Dennis, Lydia...April 17, 1771 Dennis, John...Aug 18, 1775 Dennis, Deborah, of Obediah and Phebe(2nd wife)...Feb 13, 1783 Dennis, Phebe....Dec 27, 1787 Dennis, Ruth...July 26, 1791 Dennis, Major, of Susannah, Feb 18, 1778 Dennis, Hannah, of Redford and Abigail....March 28, 1781 Dennis, Enock....Jan 10, 1783 Dennis, Lusannah...July 30, 1785 Dennis, Europa....Oct 22, 1788 Dennis, Peleg, of Robert and Elce....Oct 30 1793 Dennis, Joseph of John and Rhoba...Aug 19, 1800 Dennis, Daniel....Dec 1, 1802 Dennis, Mary....June 7, 1805 Dennis, Eliza, of Major and Eunice....Oct 4, 1801 Dennis, Nancy...Mar 3, 1803 Dennis, Holder....Oct 25, 1805
From Newport RI Marriages: Vital Records of Rhode Island Dennis, Sarah and Thomas Wrightington, Jan 7 1728-9 Dennis, Chloe, and Samuel Blackwell, oct 25, 1756 Dennis, Frances and Samuel Young, Aug 6 1839 Dennis, Elizabeth and David Melville, Dec 10, 1843 Dennis, John D and Mary P Hazard , m by Rev Henry Jackson, Sept 27, 1847 Dennis, Capt William H of San Franciso, Cal, and Leone Nigri of said place, m by Rev Benjamin Brierly, Feb 18, 1857
This from VOL II of Rhode Island Vital Records, Birth 1590-1930 from Newport Common Burial Ground Inscriptions.] Dennis, Charles T. 1854-1943 Mary Elizabeth James, his wife, 1863-1936 Little Fannie, dau of Charles T and Mary E. Dennis b 15 Feb 1885, d 9 June 1889 buried near the abouve is: Dennis, Robert A "our son" b 31 May 31, 1922 d 27 may 1924 Dennis, Mary A, d 15, Oct 1828 age 18 m0 7 d (cyb) 1827, buried near Capt. Peter Dennis b 1790 & William C Dennis b 1796 Dennis, Capt Peter d 24 June 1840 age 50 y (cyb 1790) buried near William C Dennis b 1796 & mary A Dennis b 1827 Dennis, Peter, no stone, compare entry above Dennis, Hannah Jouvet( I've added the surname) wife of Peter Dennis b 15, July 1793, d 29 May 1876, our Mother, white stone. >>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> PORTSMOUTH RI births and deaths Dennis, Sarah of Joseph and Sarah...July 1, 1723 Dennis Sarah...d Aug 25, 1723 Dennis, Sarah 2nd..,.April 1, 1725 Dennis, Sarah 2n...d Jan 26 1728 Dennis, Robert.....Sept 12, 1727 Dennis, Joseph....Jan 15, 1729 Dennis, Joseph....d Sept 28 1758 Dennis, Ann...Dec 19 1731 Dennis, Ruth...Dec 6 1733 Dennis, Lydia...Oct 12, 1735 Dennis, Freeborn...Aug 18, 1739 Dennis, Joseph Sr....d Oct 24 1759 Dennis, Sarah his wife...d April 21 1759 Dennis, Gideon, of Robert and Hannah....July 8, 1752 Dennis, Hannah....May 28, 1756 Dennis, Joseph....May 31, 1759 Dennis, Robert...Jan 11, 1762 Dennis, Thomas...Sept 23, 1764 Dennis, Jonathan...Jan 15, 1767 Dennis, George...June 26, 1769 Dennis, Mary...Feb 14, 1772 Dennis, Hannah of Jr and Ruth....13th 7m, 1784 Dennis, Hannah....d April 12, 1868 Dennis, Sarah...28th 3 m, 1786 continue from Portsmouth RI Births and death records Dennis, Isaac...30th 4m, 1788 Dennis, Rebeckah....12th, 11m, 1789 Dennis, Ruth...16th 10m, 1791 Dennis, David...4th, 8m, 1793 Dennis, Abel...30th, 4m,1795 Dennis, Abel...d Feb 6, 1797 Dennis, Robert...3d, 8m, 1797 Dennis, Anthony...13th, 6m, 1799 Dennis, Walter....18th, 7m, 1801 Dennis, Darius.....1st, 6m, 1803 Dennis, John, of Gideon and Mary....Mar 31, 1787 Dennis, Robert....Feb 25, 1789 Dennis, Phebe....Nov 6 1790 Dennis, Gideon....Feb 27, 1793 Dennis, Job....April 3, 1795 Dennis, William...Jan 20, 1797 Dennis, Mary...Nov 18, 1798 Dennis, Edward....Feb 18, 1801 Dennis, Richmond....Feb 27, 1803 Dennis, Charles....July 5, 1805 Dennis, Joseph....Nov 8, 1807 Dennis, Sarah Ann...Oct 1, 1814 continuation of Portsmouth information Dennis, Anna, of Jonathan and Hannah...22d, 9m, 1792 Dennis, Abigail....18th, 5m, 1794 Dennis, Samuel.....19th, 2m, 1796 Dennis, Ruth....16th, 10m, 1797 Dennis, Mary....29th, 4m, 1790 Dennis, James...1st 2m, 1801 Dennis, Richard.....5th, 9m, 1802 Dennis, Jonathan...21st, 8m, 1805 Dennis, Jonathan...d 15th, 3m, 1806 Dennis, Jonathan 2d......24th, 5m, 1809 Dennis, William.....10th, 10m. 1811 This is all I have on the various Dennis families of Rhode Island . it is my hope that this will help a DENNIS researcher somewhere "out there". Susan Dennis Winters