| Twins/tweeling | |||||
| * | illegitimate/onwettig | ||||
| ** | abandoned child/vondeling | ||||
| Last name/naam | First name/voornaam | Father/Vader | Mother/moeder | First name/voornaam | birthdate/geboortedatum |
| OELBRANDT | Josina | Petrus | SCALEVENS | Catharina | April 1628 |
| OELBRANDT | Elisabeth | Gorris | Elizabeth | 22 December 1621 | |
| OELBRANDT | Michael | Gorris | Elizabeth | 12 November 1617 | |
| OPSOEN | Maria | Judocus | NUYT | Joanna | 14 January 1688 |
| OPSOMIE | Judocus | Judocus | VEYT | Joanna | 23 August 1690 |
| OPSOMER | Sebastianus | Judocus | NIJT | Joanna | 31 January 1694 |
| OPSOMER | Catharina | Judocus | NEIJT | Joanna | 7 February 1697 |
| OPSOMER | Jan Baptist | Judocus | NUYT | Joanna | 1 January 1701 |
| ORICK | Guilelmus | Petrus | SCHRIJVERS | Anna | 9 November 1664 |
| ORLENT | Jaobus Franciscus | Franciscus | LIJSSENS | Joanna Catharina | 9 December 1755 |
| ORLENT | Jan Jacobus | Jacobus Franciscus | VAN DOMELEN | Joanna Francisca | 10 November1778 |
| ORLENT | Petrus jacobus | Jacobus Franciscus | VAN DOMMELEN | Joanna Francisca | 7 November 1779 |
| ORTEN | Maria Jacoba | Franciscus | LYSSENS | Maria Catharina | 25 December 1753 |
| ORTIES | Theresia | Alfonsus | WILCKE | Clara | 8 March 1651 |
| ORTIS | Prudentia | Alousius | WILCKE | Clara | 25 February 1646 |
| OSTENS | Melchior Franciscus | Adriannus | CONSALE | Elizabeth | 14 April 1651 |
| OUDENAERT | Elizabeth | Jacobus | LAES | Magdalena | 8 November 1742 |
| OVERTVELT | JUdocus | Petrus | VERHAEGHEN | Catharina | 7 December 1743 |