| Budgie name | Entries | Country |
| O'Banion | 1 | USA |
| O'Malley | 1 | Germany |
| O'Neill | 1 | Germany |
| Oak | 1 | |
| Oak | 1 | India |
| Oakley | 1 | |
| Oakley | 1 | Canada |
| Oasis | 1 | Canada |
| Obama | 2 | Germany |
| Obelix | 12 | Germany |
| Obelix | 1 | Switzerland |
| Obelix | 1 | |
| Obi Wan | 1 | USA |
| Obi-Wan | 1 | Germany |
| Obi-wan Kenobi | 1 | |
| Obie | 1 | |
| Ocean | 6 | Germany |
| Ocean | 2 | |
| Ocean | 3 | USA |
| Ocean Tide | 1 | Canada |
| Ocean Ty | 1 | Switzerland |
| Ochse | 1 | Germany |
| Octa | 1 | Canada |
| Octavius | 1 | Germany |
| Od | 1 | Germany |
| Oddo | 1 | USA |
| Odessey | 1 | Switzerland |
| Odie | 1 | Australia |
| Odin | 1 | Switzerland |
| Odin | 1 | |
| Odin | 17 | Germany |
| Odin | 1 | Netherlands |
| Odine | 6 | Germany |
| Odo | 1 | Germany |
| Ody | 1 | Germany |
| Odysseus | 1 | Germany |
| Oeffi | 1 | Germany |
| Offler | 1 | Germany |
| Ofira | 1 | Switzerland |
| Oggi | 1 | Germany |
| Ogi | 1 | Switzerland |
| Ogli | 1 | Germany |
| Ogre | 1 | USA |
| Oh-Gee San | 1 | USA |
| OhBurd | 1 | USA |
| Ohne Namen | 1 | Germany |
| Oi Oi | 1 | Germany |
| OIli | 55 | Germany |
| Oizo | 1 | |
| Ojo | 1 | Switzerland |
| Okki | 1 | Netherlands |
| Okko | 2 | Germany |
| Oksis | 1 | Lithuania |
| Olaf | 8 | Germany |
| Olaya | 1 | Switzerland |
| Old Blue | 1 | Germany |
| Old Clams | 1 | USA |
| Old Falla | 1 | New Zealand |
| Old Henry | 1 | Germany |
| Old Man | 1 | Australia |
| Ole | 9 | Germany |
| Ole van der Peti | 1 | Germany |
| Ole-Einar | 1 | Germany |
| Olec | 1 | Germany |
| Olegg | 1 | Germany |
| Olga | 5 | Germany |
| Olga-Charlotte | 1 | Germany |
| Oli | 7 | Germany |
| Oli | 2 | Switzerland |
| Oli | 1 | Serbia |
| Olic | 1 | Germany |
| Olio | 1 | USA |
| Oliri | 1 | Germany |
| Oliv | 1 | Germany |
| Oliva | 1 | Sweden |
| Olive | 3 | USA |
| Olive | 7 | Germany |
| Olive | 2 | |
| Olive | 2 | Canada |
| Oliver | 5 | Australia |
| Oliver | 7 | Germany |
| Oliver | 1 | |
| Oliver | 1 | Israel |
| Oliver | 3 | Canada |
| Oliver | 1 | Norway |
| Oliver | 1 | Switzerland |
| Oliver | 1 | Hungary |
| Oliver | 3 | USA |
| Oliver | 2 | |
| Olivia | 29 | Germany |
| Olivia | 1 | Sweden |
| Olivia | 2 | Switzerland |
| Olivia | 1 | |
| Olivie | 1 | Germany |
| Olivio | 1 | Germany |
| Olla | 1 | Germany |
| Olli | 2 | |
| Ollie | 4 | Australia |
| Ollie | 6 | |
| Ollie | 1 | Canada |
| Ollie | 1 | Netherlands |
| Ollie | 1 | |
| Ollie | 1 | Australia |
| Ollie | 1 | |
| Ollie | 2 | USA |
| Ollili | 1 | Germany |
| Olline | 1 | Germany |
| Olly | 2 | |
| Oma | 4 | Germany |
| Ombrie | 2 | Germany |
| Omdi | 1 | Germany |
| Omega | 1 | Germany |
| Omi | 2 | Germany |
| Omi Lieselotte | 1 | Germany |
| Omlette | 1 | Australia |
| Omlor | 1 | Germany |
| Omolet | 1 | |
| Omud | 1 | Germany |
| Oni | 1 | Germany |
| Onkel Binci | 1 | Germany |
| Onkel Hermann | 1 | Germany |
| Onkel Lemmy | 1 | Germany |
| Onni | 1 | Finland |
| Onno | 1 | Germany |
| Onon | 1 | USA |
| Onslow | 1 | Germany |
| OO7 | 1 | Australia |
| Opa | 3 | Germany |
| Opa | 1 | Sweden |
| Opal | 6 | Australia |
| Opal | 1 | Germany |
| Opal | 1 | |
| Opal | 1 | Canada |
| Opal | 4 | USA |
| Ophalia | 1 | Germany |
| Ophelia | 4 | Germany |
| Ophelia | 1 | Canada |
| Opie | 1 | Canada |
| Opie | 1 | USA |
| Opiparus | 1 | Germany |
| Optimus Prime | 1 | Australia |
| Oran | 1 | USA |
| Orazio | 1 | Switzerland |
| Orchid | 1 | Canada |
| Orchid | 1 | USA |
| Orco | 1 | Germany |
| Orcun | 1 | |
| Oreo | 1 | Canada |
| Oreon | 1 | Canada |
| Orfey | 1 | Germany |
| Orie | 1 | Canada |
| Orinoco | 1 | |
| Orion | 10 | Germany |
| Orion | 1 | Canada |
| Orion | 1 | Switzerland |
| Orka | 1 | Germany |
| Orko | 1 | Germany |
| Orla | 1 | Ireland |
| Orlando | 3 | Germany |
| Orlin | 1 | Germany |
| Orni | 1 | Germany |
| Oro | 1 | Germany |
| Orome | 1 | Germany |
| Orpheus | 3 | Germany |
| Orson | 1 | Germany |
| Orus | 1 | Italy |
| Orville | 1 | Germany |
| Orville | 1 | |
| Orwell | 1 | USA |
| Osama | 1 | Ireland |
| Osama | 1 | Canada |
| Osca | 1 | Germany |
| Oscar | 7 | |
| Oscar | 1 | Canada |
| Oscar | 1 | Norway |
| Oscar | 1 | Czech Republic |
| Oscar | 2 | USA |
| Oscar | 5 | Australia |
| Oscar | 28 | Germany |
| Oschisch | 1 | Germany |
| Oscuro | 1 | Germany |
| Oshi | 1 | Germany |
| Osi | 1 | Germany |
| Osie | 1 | Germany |
| Osiris | 6 | Germany |
| Osiris | 1 | Switzerland |
| Oskar | 67 | Germany |
| Oskar | 1 | Switzerland |
| Oskar | 1 | Czech Republic |
| Oskar de la Renta | 1 | Germany |
| Oskari | 1 | Germany |
| Oskarine | 1 | |
| Oskarline | 1 | Germany |
| Osman | 1 | Germany |
| Osprey | 1 | Australia |
| Osprey | 1 | |
| Ossi | 7 | Germany |
| Ossi | 1 | |
| Oswald | 2 | Germany |
| Oswald | 1 | |
| Otello | 1 | Germany |
| Othello | 1 | Australia |
| Othello | 4 | Germany |
| Othello | 1 | Canada |
| Othilie | 1 | Germany |
| Ottensen | 1 | Germany |
| Ottfried | 1 | Germany |
| Otti | 7 | Germany |
| Ottikar | 1 | Germany |
| Ottilie | 6 | Germany |
| Otto | 1 | Australia |
| Otto | 48 | Germany |
| Otto | 1 | Norway |
| Otto | 2 | |
| Otto man | 1 | Australia |
| Otto von Heinzbert | 1 | Germany |
| Ottokar | 1 | Germany |
| Ottoline | 1 | Germany |
| Ouzo | 1 | Germany |
| Ovis | 1 | Germany |
| Owen | 1 | |
| Owl | 1 | Australia |
| Owynne | 1 | Australia |
| Ox | 1 | Germany |
| Oyster | 1 | Malta |
| Oyuna | 2 | Switzerland |
| Oz | 1 | |
| Ozie | 1 | |
| Ozzie | 6 | Australia |
| Ozzie | 1 | Germany |
| Ozzie | 2 | |
| Ozzy | 5 | Germany |
| Ozzy | 4 | |
| Ozzy | 1 | Canada |
| Ozzy | 1 | Sweden |
| Ozzy | 1 | Switzerland |
| Ozzy | 1 | USA |
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