- Opalka
- Oppenheim
- Orchard
- Orcutt
- Alexis
- Anna Marie Born: October 17, 1915, Died: June 1, 2010
- Daniel
- Dean
- Dennis
- Donald Lee, Sr. Born: August 1, 1927, Died: October 8, 1992
- Donald Lee, Jr. Born: September 5, 1949, Died: April 16, 2018
- Edward, (Dr.)
- Elmer Ellsworth Born: 1863, Died: 1944
- Elmer Thomas Born: June 10, 1930, Died: September 14, 1931
- Genevieve Hope Born: September 13, 1920, Died: May 30, 2006
- Georgia Mae Born: November 13, 1917, Died: October 9, 2009
- Glen Rusty Born: August 13, 1949, Died: August 16, 2008
- Glenda
- Glenn Hope Born: March 22, 1896, Died: October 16, 1962
- Glenn John Born: August 17, 1923, Died: October 4, 2001
- Jill
- John Elmer Born: November 22, 1935, Died: March 18, 2022
- Joyce Fay Born: August 16, 1919, Died: September 27, 1999
- Kayleigh
- Paul
- Orlando
- Angela Born: November 15, 1869
- Angelo
- Anna
- Carmela Born: 1760
- Carmela Born: 1761, Died: November 5, 1831
- Clarice Maria Born: 1823
- Cosimo Born: September 25, 1815
- Ferdinando
- Francesco
- Francesco Died: February 23, 1815
- Francesco Saverio Maria Born: October 21, 1812
- Giovanni
- Giovanni Maria Born: January 10, 1814
- Girolama
- Giuseppe
- Giuseppe
- Giuseppe Born: March 18, 1824
- Isabella
- Lorenza Born: 1798
- Margarita Born: 1799, Died: November 12, 1821
- Maria Born: 1800
- Maria Malia Born: 1816
- Marianna
- Nicola
- Paolo Antonio Born: 1778
- Rosario Born: September 3, 1834
- Saverio Born: 1765
- Sebariano Born: 1790
- Teresa
- Teresa Born: 1799
- Vittoria Born: 1789
- Orlandro
- Orme
- Ormiston
- Elmer Died: July 28, 1975
- Orofino
- Orr
- Orsillo
- Agnesa Pellegrina Born: September 15, 1851
- Alberico "Albert" Born: October 19, 1915, Died: March 4, 1983
- Angelo Raffaele Born: June 10, 1885
- Anna
- Anthony Born: December 19, 1911, Died: March 13, 2011
- Antonio
- Antonio Born: 1783
- Antonio Born: 1808, Died: September 24, 1837
- Antonio Born: July 10, 1849
- Cosimo Born: 1806, Died: February 19, 1842
- Filomena Born: April 4, 1887
- Francesco
- Francesco Born: December 30, 1876
- Francesco "Frank" Born: March 1, 1882
- Francesco Pasquale Born: May 17, 1814
- Frank Born: 1933
- Giuseppe Born: February 28, 1875
- John Born: June 11, 1919
- John Anthony
- Joseph Richard Born: February 3, 1926
- Lena "Lee" Born: 1924
- Lina "Filomena" Born: May 28, 1917, Died: August 10, 2015
- Lucille Born: September 20, 1912, Died: March 1, 2009
- Maria Anna Born: January 1, 1818
- Maria Girolama Born: February 17, 1810
- Maria Giuseppa Born: 1815, Died: January 4, 1819
- Maria Teresa Born: May 30, 1856
- Mariantonia Born: January 1, 1818
- Mariateresa Born: 1806
- Michael Born: 1930
- Michele Born: 1770, Died: September 23, 1837
- Michele Born: September 16, 1852
- Michele Born: October 6, 1858
- Nicola Born: May 5, 1821
- Pasquale
- Pellegrina Born: 1797
- Pellegrino Andrea Born: 1819, Died: December 22, 1821
- Teresa
- Vittoria
- Orsini
- Ortt
- Ory
- Osborne
- Osenburg
- Ospedale
- Oswald
- Otis
- Otto
- Ovens
- Charley J. Born: August 1894
- Clara Elfrieda Born: September 19, 1899, Died: September 3, 1959
- Edna Margaretha Born: January 20, 1897
- Frank Otto Born: January 15, 1895, Died: August 12, 1939
- Johannes Hermann Born: April 6, 1865, Died: January 16, 1910
- Peter
- Peter, Jr. Born: 1919
- Peter Carl Born: August 7, 1893, Died: December 17, 1942
- Phyllis Born: 1924
- Owens
- Owsley
- Edna A. Born: February 13, 1859, Died: October 18, 1859
- Eva Jane Born: July 27, 1868, Died: January 28, 1923
- Isaac B. Born: October 8, 1860, Died: April 18, 1861
- Mary Lucy Born: August 26, 1866, Died: May 26, 1927
- Sarah Ann Born: February 16, 1863, Died: September 13, 1864
- Thomas Born: 1806, Died: 1882
- William Born: June 14, 1834, Died: June 8, 1876
- Oxley
- Oyler
- Pacha
- Pacheco
- Pacifico
- Pacione
- Padzunas
- Paga
- Colomba
- Cosimo Maria Born: December 31, 1850
- Costanza Maria Born: March 17, 1848
- Federico
- Federico Born: 1776, Died: January 11, 1841
- Federico Maria Born: August 4, 1841
- Felice
- Giovanna Born: November 10, 1860
- Giovanna Maria Born: February 15, 1844
- Giovanna Maria Born: October 4, 1853
- Giovanni Died: March 31, 1813
- Giovanni Maria Born: March 22, 1814
- Girolamo Born: 1779, Died: August 4, 1836
- Libera Born: 1754, Died: July 1, 1818
- Orazia Born: 1800, Died: February 28, 1840
- Paolina Carmina Maria Born: July 15, 1809
- Paolina Maria Born: July 4, 1822, Died: August 13, 1843
- Rosa
- Rosa Maria Born: February 15, 1857
- Selestica Maria Born: 1801
- Pagel
- Pagie
- Pagliaro
- Painter
- Nicolas Born: 1624, Died: December 1684
- Ursula Born: 1643, Died: December 12, 1700
- Pairinsi
- Pake
- Paladino
- Palermio
- Palmer
- Palmieri
- Palmisano
- Palmquist
- Palombino
- Palumbo
- Pankey
- Pannell
- Panno
- Pannullo
- Pantermehl