Last Names That Start With O
These last names that start with O come from the US Census surname list, which counts every surname shared by at least 100 people. It holds 2,471 surnames beginning with O; below are the 100 most common, plus short, long and uncommon ones.
The O list holds 2,471 surnames, led by Ortiz at rank 94. Owens and Olson come next, both quick two-syllable names.
The O' prefix, which means descendant of, is the big story for this letter. Our data stores names such as Obrien and Oconnor without the apostrophe, but families usually write them with one. Forms, websites and databases handle that mark badly, so expect variations.
Olson and Olsen differ by one vowel, and Owen and Owens by one letter. Both pairs often get mixed in records.
- Surnames starting with O
- 2,471
- Most common
- Ortiz 214,683 people
- National rank of the top one
- #94
100 most common last names that start with O
"US rank" is the surname's place among all surnames in the country; "People" is how many people had it.
| # | Last name | US rank | People |
|---|---|---|---|
| 1 | Ortiz | #94 | 214,683 |
| 2 | Owens | #126 | 176,334 |
| 3 | Olson | #136 | 163,502 |
| 4 | Obrien | #234 | 115,385 |
| 5 | Oliver | #248 | 111,641 |
| 6 | Ortega | #296 | 93,131 |
| 7 | Oconnor | #385 | 74,756 |
| 8 | Osborne | #457 | 65,802 |
| 9 | Owen | #496 | 60,461 |
| 10 | Olsen | #521 | 57,357 |
| 11 | Ochoa | #523 | 57,210 |
| 12 | Oneill | #633 | 48,656 |
| 13 | Oneal | #680 | 46,161 |
| 14 | Orozco | #690 | 45,289 |
| 15 | Orr | #714 | 43,666 |
| 16 | Odonnell | #728 | 42,802 |
| 17 | Oconnell | #886 | 35,610 |
| 18 | Odom | #953 | 33,717 |
| 19 | Osborn | #991 | 32,044 |
| 20 | Odell | #1,034 | 30,951 |
| 21 | Oneil | #1,145 | 28,020 |
| 22 | Ott | #1,265 | 25,492 |
| 23 | Otto | #1,483 | 22,001 |
| 24 | Oleary | #1,496 | 21,904 |
| 25 | Ohara | #1,565 | 21,068 |
| 26 | Olvera | #1,778 | 18,512 |
| 27 | Ogden | #1,782 | 18,461 |
| 28 | Overton | #1,822 | 18,094 |
| 29 | Osorio | #1,827 | 18,037 |
| 30 | Ocampo | #1,903 | 17,334 |
| 31 | Ornelas | #1,909 | 17,278 |
| 32 | Omalley | #1,938 | 17,027 |
| 33 | Oakes | #1,943 | 17,008 |
| 34 | Otero | #1,947 | 16,956 |
| 35 | Olivares | #1,961 | 16,857 |
| 36 | Okeefe | #1,966 | 16,829 |
| 37 | Oakley | #1,984 | 16,733 |
| 38 | Orourke | #2,044 | 16,263 |
| 39 | Olivas | #2,053 | 16,164 |
| 40 | Ojeda | #2,110 | 15,780 |
| 41 | Orellana | #2,229 | 14,943 |
| 42 | Oliva | #2,241 | 14,892 |
| 43 | Oliveira | #2,311 | 14,341 |
| 44 | Oswald | #2,313 | 14,332 |
| 45 | Ogle | #2,362 | 14,050 |
| 46 | Ouellette | #2,455 | 13,498 |
| 47 | Oh | #2,477 | 13,366 |
| 48 | Oldham | #2,604 | 12,753 |
| 49 | Orlando | #2,688 | 12,353 |
| 50 | Ontiveros | #2,693 | 12,317 |
| 51 | Overstreet | #2,732 | 12,121 |
| 52 | Oglesby | #2,733 | 12,117 |
| 53 | Ordonez | #2,906 | 11,366 |
| 54 | Oates | #2,914 | 11,346 |
| 55 | Oreilly | #2,946 | 11,224 |
| 56 | Osullivan | #3,054 | 10,879 |
| 57 | Otoole | #3,112 | 10,663 |
| 58 | Oshea | #3,258 | 10,066 |
| 59 | Ostrander | #3,520 | 9,274 |
| 60 | Olivarez | #3,896 | 8,378 |
| 61 | Outlaw | #3,904 | 8,365 |
| 62 | Olivo | #3,948 | 8,262 |
| 63 | Olmstead | #4,181 | 7,859 |
| 64 | Olguin | #4,197 | 7,835 |
| 65 | Orosco | #4,210 | 7,802 |
| 66 | Oden | #4,218 | 7,786 |
| 67 | Ocasio | #4,268 | 7,685 |
| 68 | Osburn | #4,274 | 7,673 |
| 69 | Otis | #4,338 | 7,579 |
| 70 | Ong | #4,343 | 7,572 |
| 71 | Olds | #4,355 | 7,533 |
| 72 | Ogrady | #4,617 | 7,024 |
| 73 | Olmos | #4,644 | 6,985 |
| 74 | Oaks | #4,646 | 6,982 |
| 75 | Ostrowski | #4,647 | 6,980 |
| 76 | Oxendine | #4,899 | 6,587 |
| 77 | Olivera | #5,021 | 6,412 |
| 78 | Overby | #5,063 | 6,354 |
| 79 | Orth | #5,126 | 6,284 |
| 80 | Orton | #5,154 | 6,246 |
| 81 | Obryan | #5,185 | 6,192 |
| 82 | Osman | #5,329 | 6,017 |
| 83 | Osgood | #5,346 | 5,999 |
| 84 | Ochs | #5,490 | 5,827 |
| 85 | Orta | #5,502 | 5,808 |
| 86 | Osuna | #5,516 | 5,793 |
| 87 | Oster | #5,534 | 5,771 |
| 88 | Olivier | #5,585 | 5,703 |
| 89 | Olszewski | #5,655 | 5,628 |
| 90 | Olive | #5,659 | 5,622 |
| 91 | Olinger | #5,706 | 5,572 |
| 92 | Oviedo | #5,732 | 5,540 |
| 93 | Ovalle | #5,792 | 5,466 |
| 94 | Oberg | #5,804 | 5,457 |
| 95 | Oliphant | #5,813 | 5,448 |
| 96 | Osteen | #5,933 | 5,341 |
| 97 | Overman | #6,026 | 5,256 |
| 98 | Ordaz | #6,070 | 5,211 |
| 99 | Oquinn | #6,078 | 5,205 |
| 100 | Ozuna | #6,120 | 5,162 |
Short last names that start with O
- Owen
- Orr
- Odom
- Ott
- Otto
- Ogle
- Oh
- Oden
- Otis
- Ong
- Olds
- Oaks
- Orth
- Ochs
- Orta
- Olin
- Otte
- Omar
- Odum
- Odle
Long last names with O
- Overstreet
- Oshaughnessy
- Ocallaghan
- Oppenheimer
- Oberholtzer
- Oberlander
- Orzechowski
- Occhipinti
- Olejniczak
- Overholser
- Osterhoudt
- Obermiller
- Obradovich
- Ostergaard
- Ostermiller
- Oppedisano
Uncommon last names that start with O
Real surnames outside the most common few thousand, useful for characters or usernames that still sound natural.
- Osullivan
- Otoole
- Oshea
- Ostrander
- Olivarez
- Outlaw
- Olivo
- Olmstead
- Olguin
- Orosco
- Oden
- Ocasio
- Osburn
- Otis
- Ong
- Olds
- Ogrady
- Olmos
- Oaks
- Ostrowski
- Oxendine
- Olivera
- Overby
- Orth
- Orton
- Obryan
- Osman
- Osgood
- Ochs
- Orta
Filter every last name that starts with O
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Questions people ask
What is the most common last name that starts with O?
Ortiz, shared by 214,683 people in the US Census count, ranked #94 among all surnames.
How many last names start with O?
The Census list has 2,471 surnames starting with O that are shared by at least 100 people.
What are unique last names that start with O?
Less common real surnames include Osullivan, Otoole, Oshea, Ostrander, Olivarez, Outlaw.
What are short last names that start with O?
Owen, Orr, Odom, Ott, Otto, Ogle, Oh, Oden.
Source: the US Census surname list (every surname shared by 100 or more people). Spellings are shown as listed, without accents or apostrophes.