- O'Flaherty
- O'Leary
- O'Neil
- Oakley
- Oberdorff
- Obermann
- Oblinger
- Ochs
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Adam b. 4 Nov 1841Amalia b. 29 Aug 1850Carolina b. 26 Apr 1847Catharina b. 29 Aug 1850Franz b. 2 Jul 1840Heinrich b. 12 Oct 1838, d. c 1839Heinrich b. 10 Mar 1846, d. c 1846Heinrich b. 15 May 1855Heinrich Jakob b. 19 Feb 1802Jakob b. 4 Sep 1832Johann b. 27 Mar 1834Johann Jakob b. c 1770, d. b 1827Josef b. 4 Nov 1835, d. c 1836Karl b. 24 Feb 1843Margaretha b. 15 Dec 1830Maria Anna b. 23 Apr 1829Mathilda b. 8 Feb 1862, d. 4 Jun 1947
- Ockuly
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Francis b. c 1815Frank b. c 1849, d. 13 Jul 1883
- Odum
- Oeder
- Oelberg
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Edward b. 4 Nov 1873, d. 25 Apr 1946
- Oetker
- Offener
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Johann Jakob b. c 17 Apr 1685Johann Peter b. c 14 Feb 1722
- Ogers
- Ohlemacher
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Frederick Jr. b. c 1883
- Ohler
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Lolagene b. 3 Nov 1925, d. 17 Nov 2010
- Old
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Hannah d. c 15 Jun 1819
- Oliver
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John H b. 4 Apr 1904, d. 15 Feb 1957
- Olsson
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Hilda b. 27 Jul 1890, d. Feb 1978
- Omlor
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Catherine b. c 10 May 1811, d. 8 Oct 1894
- Oney
- Onstwedder
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Nellie b. 1905
- Opperman
- Oprisch
- Oprzadek
- Orewiler
- Orians