| Country | First name | Last name | Organisation |
|---|---|---|---|
| AFGHANISTAN | IO | OL | MN |
| AFGHANISTAN | KX | OL | NT |
| AFGHANISTAN | XY | OL | EQ |
| AFGHANISTAN | OL | XA | |
| NIGERIA | ARULOGUN | OLADIRAN TAYO | LAUTECH, OGBOMOSO |
| NIGERIA | Alowooja | Olamide | INTECU |
| NIGERIA | Christiana | Olayinka | Yaba College of Technology |
| MONTENEGRO | Olen | Olen | LV |
| TAIWAN, PROVINCE OF CHINA | Olga | Olga | PK |
| CHRISTMAS ISLAND | Olga | Olga | OJ |
| LIBYAN ARAB JAMAHIRIYA | Oliva | Oliva | CN |
| BOSNIA AND HERZEGOVINA | Oliva | Oliva | SK |
| SURINAME | Olive | Olive | DO |
| DOMINICA | Oliver | Oliver | OW |
| MOZAMBIQUE | Oliver | Oliver | EQ |
| CYPRUS | Olivia | Olivia | SL |
| COLOMBIA | Olivia | Olivia | OJ |
| NORTHERN MARIANA ISLANDS | Olivia | Olivia | YK |
| SLOVAKIA | Olivia | Olivia | VD |
| UNITED STATES MINOR OUTLYING ISLANDS | Olivia | Olivia | IE |
| TOKELAU | Olivia | Olivia | MQ |
| PHILIPPINES | Ollie | Ollie | SX |
| HONDURAS | Ollie | Ollie | RZ |
| KENYA | Charles | Oloo | ISOC Kenyan Chapter |
| TUVALU | Jessenia | Olsen | cxe |
| BRITISH INDIAN OCEAN TERRITORY | Janiyah | Olson | ncz |
| KENYA | Oscar | Oluoch | Joachim International |
| VIET NAM | EQ | OM | JI |
| NIUE | SN | OM | JT |
| CROATIA | SI | OM | DV |
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