| Termen/ Term | Nr. apariții/ No. occurrences |
| OLGA STETI | 4 |
| OLGYAI VICTOR | 1 |
| OLGYAI VIKTOR | 1 |
| OLGYAY FERENC | 2 |
| OLINESCU MARCEL | 136 |
| OLINESCU MIRCEA | 15 |
| OLIVA Y RODRIGO EUGENIO | 1 |
| OLIVAREZ REYNALDO | 1 |
| OLOS MIHAI | 4 |
| OLSZEWSKI GEORGE | 11 |
| OLTEANU STINCA AUREL | 1 |
| OLTENIA | 343 |
| OLTES IOANA | 10 |
| OLTETULUI | 1 |
| ONGAMIA UMBERTO | 1 |
| ONGHI GIOSESSO | 1 |
| ONISA SILVIA | 4 |
| ONISIFOR ZUGRAV | 1 |
| ONITA IULIA | 5 |
| ONOFREI MIHAI | 7 |
| ONOFREI MIHAIL | 4 |
| ONUFRIE IEROMONAH | 9 |
| ONUT VASILE | 1 |
| OPARICA CONSTANTIN | 2 |
| OPPENHEIMER JOSEPH | 1 |
| OPPLER ALEXANDER | 2 |
| OPREA IOAN | 1 |
| OPREA ZUGRAV | 5 |
| OPRESCU | 1 |
| OPRISAN | 1 |
| OPRISAN IULIA | 1 |
| OPRISAN LETITIA | 23 |
| OPRISOREANU ANA | 1 |
| OPROIU MARIN | 1 |
| OPRUSAN VASILE | 3 |
| OR:NEIDENTIFICAT | 1 |
| ORADEA | 29 |
| ORASANU JULIETA | 3 |
| ORASANU MATACHE | 13 |
| ORASTIE | 2 |
| ORAVITA | 1 |
| ORAVITEAN CRETU SILVIA | 1 |
| ORI | 1 |
| ORIENT JOSEF | 1 |
| ORIGINAL ETRUSC | 1 |
| ORIGINALULUI DE SEC.15 | 1 |
| ORLAI | 1 |
| ORLAI PETRICS | 1 |
| ORLAY | 1 |
| ORLIK EMIL | 2 |