Last Names Starting with O
2,781 surnames found in U.S. Census data starting with O. Sorted by Census rank.
| Rank | Name | Est. Bearers | Per 100K | Rarity |
|---|---|---|---|---|
| #68 | Ortiz | 326,690 | 97.26 | Common |
| #140 | Owens | 208,052 | 61.94 | Common |
| #157 | Olson | 186,790 | 55.61 | Common |
| #239 | Ortega | 144,904 | 43.14 | Common |
| #258 | Obrien | 134,995 | 40.19 | Common |
| #264 | Oliver | 131,972 | 39.29 | Common |
| #408 | Ochoa | 89,583 | 26.67 | Uncommon |
| #417 | Oconnor | 88,743 | 26.42 | Uncommon |
| #502 | Osborne | 76,080 | 22.65 | Uncommon |
| #512 | Orozco | 75,039 | 22.34 | Uncommon |
| #543 | Owen | 70,168 | 20.89 | Uncommon |
| #566 | Olsen | 67,582 | 20.12 | Uncommon |
| #689 | Oneill | 56,967 | 16.96 | Uncommon |
| #729 | Oneal | 54,650 | 16.27 | Uncommon |
| #774 | Orr | 50,552 | 15.05 | Uncommon |
| #795 | Odonnell | 49,477 | 14.73 | Uncommon |
| #961 | Oconnell | 41,214 | 12.27 | Uncommon |
| #996 | Odom | 39,871 | 11.87 | Uncommon |
| #1078 | Osborn | 36,948 | 11.00 | Uncommon |
| #1117 | Odell | 35,705 | 10.63 | Uncommon |
| #1199 | Osorio | 33,556 | 9.99 | Uncommon |
| #1220 | Oneil | 32,951 | 9.81 | Uncommon |
| #1275 | Olvera | 31,372 | 9.34 | Uncommon |
| #1319 | Orellana | 30,331 | 9.03 | Uncommon |
| #1373 | Ott | 29,323 | 8.73 | Uncommon |
| #1374 | Ocampo | 29,290 | 8.72 | Uncommon |
| #1490 | Olivares | 27,308 | 8.13 | Uncommon |
| #1568 | Ornelas | 26,166 | 7.79 | Uncommon |
| #1587 | Otto | 25,696 | 7.65 | Uncommon |
| #1607 | Oleary | 25,427 | 7.57 | Uncommon |
| #1633 | Ojeda | 25,091 | 7.47 | Uncommon |
| #1660 | Ohara | 24,722 | 7.36 | Uncommon |
| #1716 | Otero | 23,848 | 7.10 | Uncommon |
| #1785 | Olivas | 22,908 | 6.82 | Uncommon |
| #1835 | Oliva | 22,236 | 6.62 | Uncommon |
| #1887 | Oliveira | 21,699 | 6.46 | Uncommon |
| #1906 | Ogden | 21,464 | 6.39 | Uncommon |
| #1914 | Overton | 21,430 | 6.38 | Uncommon |
| #1952 | Ordonez | 21,061 | 6.27 | Uncommon |
| #1978 | Oh | 20,825 | 6.20 | Uncommon |
| #2046 | Omalley | 20,019 | 5.96 | Uncommon |
| #2065 | Oakes | 19,918 | 5.93 | Uncommon |
| #2079 | Okeefe | 19,818 | 5.90 | Uncommon |
| #2099 | Oakley | 19,616 | 5.84 | Uncommon |
| #2213 | Orourke | 18,743 | 5.58 | Uncommon |
| #2225 | Ontiveros | 18,642 | 5.55 | Uncommon |
| #2524 | Ogle | 16,358 | 4.87 | Uncommon |
| #2530 | Oswald | 16,324 | 4.86 | Uncommon |
| #2583 | Ouellette | 15,921 | 4.74 | Uncommon |
| #2792 | Oldham | 14,712 | 4.38 | Uncommon |