Boy Names That Start With O
These boy names that start with O come straight from US birth records: 657 different boy names starting with O were given to at least five babies in a single year. The list below starts with the 100 used most often, then splits them into names popular right now, rising names, rare finds and short or long picks.
That opening O is wide and warm, which lends these boy names a friendly feel. Oliver leads today, and Ollie, an older name in its own right, makes an easy nickname for it.
The O list is fairly small, at 657 names, yet it mixes eras well. Otto and Oscar have a retro charm, while Orion and Odin feel new.
One practical point: a surname beginning with a vowel can blur into an O first name when spoken. Try Owen with your last name and listen for a clear break between the two words.
- Boy names starting with O
- 657
- Most used ever
- Oscar 198,838 babies
- Most popular in 2017
- Oliver #9 overall
- Common endings
- -ie, -an, -in
Top 100 boy names that start with O
Ranked by how many babies have been given each name since 1880. "Peak decade" is when the name was used most; "Trend" compares the ten years to 2017 with the ten years before.
| # | Name | Babies given the name | Peak decade | Rank in 2017 | Trend |
|---|---|---|---|---|---|
| 1 | Oscar | 198,838 | 2000s | #192 | Steady |
| 2 | Owen | 177,951 | 2010s | #28 | Rising |
| 3 | Oliver | 152,922 | 2010s | #9 | Rising |
| 4 | Omar | 95,198 | 2000s | #229 | Steady |
| 5 | Otis | 57,890 | 1920s | #745 | Rising |
| 6 | Orlando | 46,880 | 1980s | #653 | Steady |
| 7 | Orville | 34,956 | 1920s | #4,894 | Steady |
| 8 | Otto | 31,946 | 1910s | #478 | Rising |
| 9 | Ollie | 16,119 | 1920s | #1,431 | Rising |
| 10 | Orion | 14,822 | 2010s | #334 | Rising |
| 11 | Odell | 14,664 | 1920s | #2,824 | Steady |
| 12 | Osvaldo | 13,464 | 2000s | #1,200 | Falling |
| 13 | Octavio | 10,373 | 2000s | #1,260 | Steady |
| 14 | Olin | 9,166 | 1920s | #1,605 | Rising |
| 15 | Omari | 8,811 | 2010s | #512 | Rising |
| 16 | Oren | 8,352 | 1920s | #1,393 | Rising |
| 17 | Omer | 8,265 | 1920s | #1,926 | Steady |
| 18 | Odis | 8,121 | 1920s | #5,743 | Steady |
| 19 | Orval | 7,915 | 1920s | not given | Rare |
| 20 | Olen | 7,347 | 1920s | #3,563 | Rising |
| 21 | Otha | 6,379 | 1920s | not given | Falling |
| 22 | Odin | 6,071 | 2010s | #368 | Rising |
| 23 | Orin | 5,637 | 1920s | #1,623 | Rising |
| 24 | Ora | 5,592 | 1920s | not given | Rising |
| 25 | Oswaldo | 5,532 | 2000s | #2,579 | Falling |
| 26 | Orrin | 5,494 | 1920s | #2,092 | Rising |
| 27 | Oakley | 5,468 | 2010s | #479 | Rising |
| 28 | Ottis | 4,382 | 1920s | #9,625 | Steady |
| 29 | Oran | 4,301 | 1920s | #4,894 | Steady |
| 30 | Obie | 4,041 | 1920s | #7,055 | Steady |
| 31 | Oswald | 3,973 | 1920s | #3,050 | Steady |
| 32 | Omarion | 3,558 | 2000s | #2,374 | Falling |
| 33 | Obed | 3,519 | 2000s | #2,158 | Steady |
| 34 | Otho | 3,328 | 1920s | not given | Rare |
| 35 | Octavius | 3,044 | 1990s | #2,278 | Steady |
| 36 | Oneal | 2,990 | 1930s | #10,700 | Steady |
| 37 | Osbaldo | 2,970 | 2000s | #4,432 | Falling |
| 38 | Oral | 2,801 | 1920s | not given | Falling |
| 39 | Ocie | 2,719 | 1920s | not given | Falling |
| 40 | Odie | 2,549 | 1920s | #8,078 | Rising |
| 41 | Olan | 2,542 | 1920s | #4,432 | Rising |
| 42 | Olaf | 2,474 | 1910s | #8,781 | Steady |
| 43 | Osman | 2,389 | 2000s | #1,476 | Steady |
| 44 | Ozzie | 2,338 | 2010s | #2,141 | Rising |
| 45 | Oskar | 2,256 | 2010s | #1,378 | Rising |
| 46 | Osiel | 2,101 | 2000s | #2,177 | Steady |
| 47 | Orland | 2,065 | 1920s | #8,781 | Steady |
| 48 | Ole | 1,954 | 1880s | #4,568 | Rising |
| 49 | Orvil | 1,935 | 1920s | not given | Rare |
| 50 | Osmar | 1,859 | 2000s | #2,177 | Steady |
| 51 | Orson | 1,839 | 2010s | #1,946 | Rising |
| 52 | Osiris | 1,803 | 2010s | #1,079 | Rising |
| 53 | Om | 1,762 | 2000s | #1,633 | Rising |
| 54 | Ozell | 1,709 | 1930s | not given | Falling |
| 55 | Oneil | 1,687 | 1920s | #6,015 | Steady |
| 56 | Oziel | 1,685 | 2010s | #2,141 | Rising |
| 57 | Orie | 1,668 | 1920s | not given | Steady |
| 58 | Oris | 1,655 | 1920s | not given | Rare |
| 59 | Obadiah | 1,647 | 2010s | #1,651 | Rising |
| 60 | Osborne | 1,618 | 1910s | #6,307 | Rising |
| 61 | Ocean | 1,589 | 2000s | #1,515 | Rising |
| 62 | Olivier | 1,539 | 2010s | #2,511 | Rising |
| 63 | Orlin | 1,533 | 1920s | #7,500 | Rising |
| 64 | Octavious | 1,480 | 1990s | #3,410 | Steady |
| 65 | Okey | 1,462 | 1920s | not given | Rare |
| 66 | Ozzy | 1,336 | 2000s | #1,772 | Steady |
| 67 | Onyx | 1,218 | 2010s | #1,051 | Rising |
| 68 | Orvel | 1,156 | 1920s | not given | Rare |
| 69 | Orvin | 1,114 | 1920s | not given | Steady |
| 70 | Ori | 1,024 | 2010s | #2,472 | Rising |
| 71 | Octavian | 1,022 | 2000s | #2,984 | Rising |
| 72 | Otoniel | 941 | 2000s | #5,080 | Steady |
| 73 | Orvis | 940 | 1920s | not given | Rare |
| 74 | Orris | 934 | 1920s | not given | Rare |
| 75 | Orlan | 922 | 1920s | #10,700 | Rising |
| 76 | Oden | 915 | 2010s | #1,907 | Rising |
| 77 | Ovidio | 911 | 1990s | #12,171 | Falling |
| 78 | Orlo | 904 | 1920s | #10,700 | New |
| 79 | Orman | 886 | 1920s | not given | Rare |
| 80 | Oryan | 877 | 2000s | #3,288 | Steady |
| 81 | Osama | 870 | 1990s | #6,307 | Falling |
| 82 | Orren | 845 | 1920s | #8,078 | Rising |
| 83 | Ontario | 828 | 1990s | #10,700 | Falling |
| 84 | Oshea | 804 | 1990s | #2,332 | Steady |
| 85 | Obinna | 754 | 2000s | #6,652 | Steady |
| 86 | Ovid | 741 | 1920s | not given | Rare |
| 87 | Othel | 732 | 1920s | not given | Rare |
| 88 | Ogden | 711 | 1920s | #5,486 | Rising |
| 89 | Omid | 684 | 1990s | #4,712 | Steady |
| 90 | Owens | 680 | 1920s | #12,171 | Rising |
| 91 | Orrie | 675 | 1920s | not given | Falling |
| 92 | Octaviano | 670 | 1930s | #12,171 | Falling |
| 93 | Obert | 619 | 1920s | not given | Rare |
| 94 | Orbie | 609 | 1920s | not given | Rare |
| 95 | Omri | 608 | 2010s | #4,194 | Rising |
| 96 | Olando | 604 | 1970s | not given | Falling |
| 97 | Orange | 598 | 1920s | not given | Rare |
| 98 | Odus | 596 | 1920s | not given | Rare |
| 99 | Othello | 593 | 1920s | #7,055 | Steady |
| 100 | Olajuwon | 589 | 1990s | #10,700 | Steady |
Popular boy names starting with O right now
The most used O names for boys in 2017, with their national rank among all boy names.
- Oliver #9
- Owen #28
- Oscar #192
- Omar #229
- Orion #334
- Odin #368
- Otto #478
- Oakley #479
- Omari #512
- Orlando #653
- Otis #745
- Onyx #1051
- Osiris #1079
- Osvaldo #1200
- Octavio #1260
- Oskar #1378
- Oren #1393
- Ollie #1431
- Oseias #1442
- Osman #1476
- Ocean #1515
- Olin #1605
- Orin #1623
- Om #1633
- Obadiah #1651
- Ozzy #1772
- Oden #1907
- Omer #1926
- Orson #1946
- Ozias #2006
Rising boy names with O
Names used far more in the last ten years than in the ten years before.
- Oakley
- Odin
- Oliver
- Otto
- Otis
- Orion
- Owen
- Omari
Unique and rare boy names that start with O
Real names that are still being given today but stay uncommon, so a child is unlikely to share it with a classmate.
- Oskar
- Om
- Obed
- Onyx
- Osiris
- Omarion
- Osman
- Osmar
- Ocean
- Osiel
- Oziel
- Obadiah
- Olivier
- Ozzy
- Oden
- Octavius
- Ori
- Ozzie
- Orson
- Osbaldo
- Octavian
- Owyn
- Oryan
- Ozias
- Oshea
- Oumar
- Octavious
- Omri
- Oakland
- Ousmane
Classic and vintage O names
Names that peaked before the 1960s. Many are now rare enough to feel fresh again.
- Otis 1920s
- Orville 1920s
- Otto 1910s
- Ollie 1920s
- Odell 1920s
- Olin 1920s
- Oren 1920s
- Omer 1920s
- Odis 1920s
- Orval 1920s
- Olen 1920s
- Otha 1920s
- Orin 1920s
- Ora 1920s
- Orrin 1920s
Short boy names that start with O
Four letters or fewer: easy to spell, easy to call across a playground.
- Owen
- Omar
- Otis
- Otto
- Olin
- Oren
- Omer
- Odis
- Olen
- Otha
- Odin
- Orin
- Ora
- Oran
- Obie
- Obed
- Otho
- Oral
- Ocie
- Odie
Long boy names with O
Eight letters or more, often with ready-made nicknames.
- Octavius
- Octavious
- Octavian
- Octaviano
- Olajuwon
- Oluwatobi
- Olegario
- Orenthal
- Oluwaseun
- Odysseus
- Oliverio
- Oluwaseyi
- Oluwafemi
- Octavion
- Oluwatimilehin
- Oluwatobiloba
Boy names that start and end with O
Names that begin and end with the same letter, O.
- Orlando
- Otto
- Osvaldo
- Octavio
- Oswaldo
- Otho
- Osbaldo
- Ovidio
- Orlo
- Ontario
- Octaviano
- Olando
- Othello
- Onesimo
- Omero
- Oracio
- Olegario
- Osualdo
- Otilio
- Orazio
Filter every boy name that starts with O
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Looking for girl names too? See girl names that start with O, all names that start with O or the name finder for any letter and ending.
Questions people ask
What is the most popular boy name that starts with O?
Oscar is the most used boy name starting with O in US records, given to 198,838 babies since 1880. In 2017 the most popular was Oliver, ranked #9 among all boy names.
How many boy names start with O?
US birth records list 657 different boy names starting with O, counting every name given to at least five babies in a year.
What are some unique boy names that start with O?
Uncommon names still in use include Oskar, Om, Obed, Onyx, Osiris, Omarion.
Which boy names start and end with O?
Orlando, Otto, Osvaldo, Octavio, Oswaldo, Otho, Osbaldo, Ovidio all begin and end with O.
What are short boy names that start with O?
Short picks include Owen, Omar, Otis, Otto, Olin, Oren, Omer.
Source: US Social Security baby name records for every name given to at least 5 babies in a year, from 1880 to 2017. Names are grouped as boy names when most babies given the name were boys.