- O'Byrne
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Inghin b. c 1094
- O'Connell
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Anna Veronica b. 1885, d. Oct 1968
- O'Connor
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Anna M. b. 3 Mar 1879, d. 5 May 1964Elizabeth b. c 1861
- O'Dell
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Aron b. 10 Feb 1876, d. 28 Apr 1947Caleb b. 21 Dec 1862, d. 11 Nov 1937David P. b. 1845, d. 1922Delbert Newton b. 29 Sep 1899, d. 31 Aug 1939Harley b. 12 Oct 1909, d. 30 Aug 1999Herman Gerald b. 24 Dec 1915, d. 22 Jul 2002Joseph Soloman b. 17 Mar 1871, d. 29 Dec 1944Lola Eris b. 24 Jan 1895, d. 30 May 1957Orpha Gay b. c 1897, d. 3 Nov 1938Reuben Ernest b. 20 Mar 1884, d. 4 Mar 1944Sophronia A. b. Aug 1874, d. 1955Vernon R. b. 9 Nov 1933, d. 9 Mar 2004Virginia Pauline b. 27 Mar 1929, d. 13 Nov 2007William Kelly d. 10 May 1935
- O'Donnell
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Anna b. Aug 1853
- O'Dwyer
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William b. c 1879
- O'Flaherty
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Martha J. b. c 1837, d. 13 Mar 1889
- O'Hara
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James Patrick b. 23 Jul 1920, d. 3 Nov 1980
- O'Keeffe
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Joseph Aaron b. 13 Apr 1891, d. 13 Feb 1976Joseph Elmer b. 13 Jan 1915, d. 12 Aug 1996
- O'Leary
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Mabel Marie b. 19 Jul 1890, d. 16 Aug 1961Rose I. b. 12 Jun 1898, d. 5 Nov 1944Thomas b. c 1865
- O'Neal
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Isaac Taylor b. 10 Jan 1889, d. 27 Aug 1960Joseph b. 1852, d. 1888M. b. 1890William T. b. c 1923, d. 26 Sep 2007