- Olson
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Ardith E. b. 1 Feb 1921, d. 3 Jul 1987Arthur b. 17 Jan 1899, d. 24 Jun 1927Augusta Hannah b. c 1862Matilda b. 1858, d. 1934
- Onkst
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Sarah Eliza b. 1 Jan 1861, d. 1 Oct 1931
- Onundsson
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Ingald 'The Wicked', King of Sweden b. c 660
- Openshaw
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Alfred b. 29 Oct 1897, d. 12 Nov 1977Carl Eugene b. 20 Dec 1922, d. 10 May 1993
- Oplaendinge
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Ivar b. c 770
- Opre
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James Harvey Gilbert b. 22 Feb 1834, d. 20 Feb 1883Lorilla Myrtle b. 14 Mar 1879, d. 25 Oct 1975
- Orange
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Russell Randolph b. 23 Mar 1910, d. 2 Feb 1995
- Oren
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Mildred Grendeline b. 24 Apr 1908, d. 9 Jan 1992Vern Hayworth b. 23 Jan 1882, d. 5 Feb 1962
- Orr
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Blanche b. 5 May 1873, d. 18 Jun 1947Charles Crisswell b. 11 Feb 1872, d. 18 Mar 1942Estella b. Apr 1891, d. 13 Jun 1958Florence Lucinda b. 10 Jan 1871, d. 14 Feb 1945Gertrude Mary b. 15 Oct 1919, d. 29 Jul 2011Harry Henderson b. 20 May 1884, d. 9 Oct 1942Leroy Lowell b. 3 Aug 1935, d. 1 Nov 1995Oliver b. Jun 1843, d. Jul 1912Oscar Jay b. 5 Sep 1899, d. 1 Nov 1974Singleton S. b. 1799, d. 1889
- Orrell
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Percy b. 15 Nov 1916, d. 10 May 1986
- Orsbourn
-
Nancy R. b. 1860, d. 1937
- Orseolo
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Ottone (Pietro) b. c 970
- Ortgier
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Albert Edward b. 4 Jun 1873, d. 15 Apr 1933May Anne b. 26 May 1894, d. 4 Nov 1965