List of People
| Display Name | Surnames | Given Names | Gender | Nationality | |
|---|---|---|---|---|---|
| O'KEEFFE Thomas | O'Keeffe | Thomas | M | ENG | |
| O’KEEFFE Stephen | O’Keeffe | Stephen | M | NED | |
| O'KELLY Catriona | O'Kelly | Catriona | F | IRL | |
| OKHMAK Denis | Okhmak | Denis | M | UKR | |
| OKISHEV Arsenii | Okishev | Arsenii | M | RUS | |
| OKRUHLICA Šimon | Okruhlica | Šimon | M | SVK | |
| OKSA Jonna | Oksa | Jonna | F | FIN | |
| OKTAR Mehmet Firat | Oktar | Mehmet Firat | M | TUR | |
| OKTAR Gokhan | Oktar | Gokhan | M | TUR | |
| OKUMUS Yasin | Okumus | Yasin | M | TUR | |
| OKUMUŞ Yeter | Okumuş | Yeter | F | TUR | |
| OKYAY Pınar | Okyay | Pınar | F | TUR | |
| OLANDER Thomas | Olander | Thomas | M | DEN | |
| OLASZ Balázs | Olasz | Balázs | M | HUN | |
| OLAUSSON Max | Olausson | Max | M | SWE | |
| OLAUSSON Emil | Olausson | Emil | M | SWE | |
| OLCAY Nihal | Olcay | Nihal | F | TUR | |
| OLCAY Şevval | Olcay | Şevval | F | TUR | |
| OLDEN Robert | Olden | Robert Thomas Feltham | M | IRL | |
| OLDENBURG Carl | Oldenburg | Carl | M | GER |