Last Names Starting with O
2,684 surnames found in U.S. Census data starting with O. Sorted by Census rank.
| Rank | Name | Est. Bearers | Per 100K | Rarity |
|---|---|---|---|---|
| #68 | Ortiz | 330,575 | 96.45 | Common |
| #143 | Owens | 200,861 | 58.60 | Common |
| #166 | Olson | 179,200 | 52.28 | Common |
| #243 | Ortega | 143,149 | 41.76 | Common |
| #261 | Obrien | 132,501 | 38.66 | Common |
| #278 | Oliver | 125,930 | 36.74 | Common |
| #408 | Ochoa | 89,365 | 26.07 | Uncommon |
| #416 | Oconnor | 87,514 | 25.53 | Uncommon |
| #500 | Orozco | 74,998 | 21.88 | Uncommon |
| #513 | Osborne | 73,503 | 21.44 | Uncommon |
| #561 | Owen | 67,613 | 19.73 | Uncommon |
| #571 | Olsen | 66,081 | 19.28 | Uncommon |
| #673 | Oneill | 56,608 | 16.52 | Uncommon |
| #733 | Oneal | 52,668 | 15.37 | Uncommon |
| #784 | Odonnell | 49,154 | 14.34 | Uncommon |
| #795 | Orr | 48,774 | 14.23 | Uncommon |
| #986 | Oconnell | 39,939 | 11.65 | Uncommon |
| #1040 | Odom | 38,038 | 11.10 | Uncommon |
| #1111 | Osborn | 35,662 | 10.40 | Uncommon |
| #1144 | Orellana | 34,543 | 10.08 | Uncommon |
| #1162 | Osorio | 34,106 | 9.95 | Uncommon |
| #1180 | Odell | 33,692 | 9.83 | Uncommon |
| #1230 | Oneil | 32,174 | 9.39 | Uncommon |
| #1285 | Olvera | 30,643 | 8.94 | Uncommon |
| #1368 | Ocampo | 29,060 | 8.48 | Uncommon |
| #1390 | Ott | 28,720 | 8.38 | Uncommon |
| #1504 | Olivares | 26,562 | 7.75 | Uncommon |
| #1595 | Otto | 25,157 | 7.34 | Uncommon |
| #1607 | Oleary | 24,924 | 7.27 | Uncommon |
| #1611 | Ornelas | 24,861 | 7.25 | Uncommon |
| #1617 | Otero | 24,768 | 7.23 | Uncommon |
| #1625 | Ojeda | 24,589 | 7.17 | Uncommon |
| #1671 | Ohara | 24,149 | 7.05 | Uncommon |
| #1694 | Oliveira | 23,761 | 6.93 | Uncommon |
| #1774 | Ordonez | 22,628 | 6.60 | Uncommon |
| #1808 | Oh | 22,285 | 6.50 | Uncommon |
| #1830 | Olivas | 22,037 | 6.43 | Uncommon |
| #1833 | Oliva | 21,995 | 6.42 | Uncommon |
| #1950 | Ogden | 20,693 | 6.04 | Uncommon |
| #1983 | Overton | 20,356 | 5.94 | Uncommon |
| #2045 | Omalley | 19,806 | 5.78 | Uncommon |
| #2061 | Oakes | 19,593 | 5.72 | Uncommon |
| #2100 | Okeefe | 19,185 | 5.60 | Uncommon |
| #2123 | Oakley | 19,022 | 5.55 | Uncommon |
| #2197 | Orourke | 18,553 | 5.41 | Uncommon |
| #2283 | Ontiveros | 17,858 | 5.21 | Uncommon |
| #2536 | Oswald | 15,914 | 4.64 | Uncommon |
| #2629 | Ogle | 15,372 | 4.48 | Uncommon |
| #2664 | Ouellette | 15,162 | 4.42 | Uncommon |
| #2770 | Osman | 14,527 | 4.24 | Uncommon |