There are 1563 O- names for baby boys.
O- names are fairly popular baby names for boys, and they are also considered rather trendy. At the height of their usage in 1901, 1.339% of baby boys were given O- names. There were 36 O- names ranked within the top 1000 baby names then. O- names have since experienced a decline in frequency. In 2011, 10 O- names listed among the top 1000, with a combined usage of 1.006%, having regained their popularity somewhat in the recent decade. Within all O- names, the English, Irish, and Welsh Owen was the most commonly used, with a ranking of #44 and a usage of 0.4114%.
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| O'Brien | exalted and high-minded ... used predominantly in Irish and it is ... listed outside of the top 1000 ... |
| O'Keefe | descendent of Caomh, descendent ...O'Keefe is of Irish Gaelic origin ... variant transcription of Keefe ... |
| O'Ryan | limit, boundary; urine ...O'Ryan's origin is Old Greek ... derivative of Orion ... |
| O'Shane | son of Shea ...is of Irish origin ... derivative of O'Shea ... infrequently used as a baby name for ... |
| O'Shea | son of Shea ...O'Shea's origin is Irish ... O'Shea is rarely used as a baby name for boys ... |
| O'shay | O'shay is of various origins ... variation of O'shea ... an infrequently used baby name for ... |
| O'shea | O'shea's origin is varied ... infrequently used as a baby name for ... not listed in the top 1000 names ... |
| O.J. | origin is English-American ... form of OJ ... ... is not frequently used as a baby boy name ... |
| Oachs | oak trees ... origin is English ... variant form of Oakes ... a rare baby boy name ... |
| Oak | oak trees ...The origin of Oak is English ... variant transcription of Oakes ... rare as a baby boy name ... |
| Oakdan | dweller in the oak valley ... origin is Old English ... form of Ogden ... unusual as a baby boy name ... |
| Oakden | dweller in the oak valley ... of Old English origin ... variant transcription of Ogden ... |
| Oakdin | dweller in the oak valley ... of Old English origin ... derivative of Ogden ... not in the top 1000 names ... |
| Oakdon | dweller in the oak valley ... has its origins in the Old English ... derivative of Ogden ... |
| Oakdun | dweller in the oak valley ...The origin of Oakdun is the Old English language ... form of Ogden ... |
| Oakdyn | dweller in the oak valley ...The origin of Oakdyn is the Old English language ... variation of Ogden ... |
| Oake | oak trees ...The origin of Oake is English ... variant transcription of Oakes ... |
| Oakea | oak trees ... origin is English ... form of Oakes ... rarely used as a baby name for boys ... |
| Oakee | oak trees ... origin is English ... form of Oakes ... rarely used as a baby name for boys ... |
| Oakes | oak trees ... has its origins in the English language ... rarely used as a baby name for boys ... |
