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| N | O | P | Q | R | S | T | U | V | W | X | Y | Z |
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O |
| Name | Romaji | Katakana |
| Oana | wa-na |
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| Obama | obama |
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| Obba | obba |
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| Octavia | okutavia |
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| Octavio | okutavio |
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| Oda | oda |
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| Odah | oda |
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| Oded | odeddo |
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| Odele | oderu |
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| Odell | oderu |
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| Odessa | odessa |
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| Odete | odette |
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| Odette | odetto |
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| Odgerel | odogereru |
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| Odilon | odiron |
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| Odoardo | odoarudo |
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| Odysseas | odesseasu |
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| Odysseas | odesseusu |
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| Odysseas | odisseasu |
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| Ofelia | ofi-ria |
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| Ofelia | oferia |
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| Ofentse | ofentse |
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| Ofira | ofira |
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| Oja | oya |
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| Oksana | okusana |
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| Okura | okura |
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| Ol | oru |
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| Ola | o-ra |
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| Olaf | orafu |
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| Olalla | oraya |
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| Olan | o-ran |
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| Olatz | oratsu |
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| Oldrich | orudorihhi |
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| Ole | o-re |
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| Oleg | oregu |
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| Olek | orekku |
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| Olesya | orishia |
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| Olga | oruga |
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| Olimpia | orinpia |
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| Olin | orin |
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| Olive | ori-vu |
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| Oliver | oriva- |
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| Olivia | orivia |
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| Olivier | orivie |
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| Olli | ori |
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| Olli | orri |
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| Ollie | ori- |
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| Olof | orofu |
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| Olwen | oruwen |
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| Olympia | orinpia |
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| Om | aun |
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| Om | o-mu |
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| Omar | oma-ru |
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| Omar | oma- |
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| Omara | oma-ra |
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| Omari | omari |
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| Omarion | omarion |
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| Omega | omega |
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| Omero | omero |
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| Omid | omiddo |
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| Omisha | omisha |
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| Ona | ona |
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| Ondrej | ondojei |
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| Ono | ono |
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| Oona | u-na |
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| Opal | opa-ru |
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| Ophelia | ofiria |
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| Ophelia | ofi-ria |
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| Ophira | ofira |
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| Oprah | opura |
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| Ora | ora |
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| Ora | o-ra |
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| Orazio | oratsio |
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| Orazio | orajio |
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| Oren | o-ren |
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| Orestes | oresutesu |
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| Orev | orevu |
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| Orfeo | orufeo |
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| Ori | ori |
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| Oriol | orioru |
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| Orla | o-ra |
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| Orlando | o-rando |
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| Ornella | orunera |
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| Ornette | o-netto |
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| Oron | oron |
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| Orso | oruso |
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| Orson | o-son |
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| Ortiz | oruti-zu |
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| Orville | o-viru |
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| Orvin | o-vin |
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| Osa | osa |
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| Oscar | osukaru |
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| Oscar | osuka-ru |
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| Oscar | osuka- |
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| Oskar | osuka- |
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| Ossie | oshi- |
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| Osvaldo | osubarudo |
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| Oswald | ozuwarudo |
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| Oswaldo | osuwarudo |
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| Oszkarne | osukarune- |
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| Otar | ota-ru |
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| Otello | oterro |
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| Othello | otero |
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| Othello | osero |
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| Othon | oton |
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| Otis | o-tisu |
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| Ottavia | ottavia |
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| Otto | otto- |
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| Otto | otto |
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| Ousmane | usuman |
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| Outi | outi |
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| Ov | ovu |
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| Ove | o-ve |
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| Ovidiu | ovidyu- |
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| Ovidiu | ovidyu |
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| Owen | o-en |
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| Owen | o-wen |
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| Oxide | okisaido |
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| Oyanka | oyanka |
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| Oz | ozu |
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| Ozie | oji- |
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| Ozzie | oji- |
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| Ozzy | oji- |
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