| Termen/ Term | Nr. apariții/ No. occurrences |
| ORLITSEK F. | 2 |
| ORLOVA M. N. | 1 |
| ORLOVSCHI-BALOGH EDITH | 1 |
| ORLOWSKI | 1 |
| ORLOWSKI MIACESLAV | 5 |
| OROVEANU ION | 1 |
| ORSEL ANDRE JACQUES VICTOR | 1 |
| ORSEL ANDREE JACQUES VICTOR | 1 |
| ORTELY ABRAHAM | 1 |
| ORTGIES E. | 1 |
| ORTHI | 1 |
| ORTO UBERTO DELL' | 1 |
| ORTODOXA | 1 |
| ORVAL LEON | 1 |
| OSAKA | 2 |
| OSCAR SCHMITH | 1 |
| OSGOOD CHARLES | 1 |
| OSHIKAWA TOYONOBU | 1 |
| OSKAR NAGY | 1 |
| OSMULYCHEIEVICI | 1 |
| OSONO | 1 |
| OSSENBECK JAN VAN | 2 |
| OSSENBEECK JAN JOSIAS | 2 |
| OSSWALD PAUL | 1 |
| OSTA DE ADRIAEN VAN | 1 |
| OSTADE A. | 1 |
| OSTADE ADRIAEN VAN | 4 |
| OSTADE ISAAC VAN | 1 |
| OSTADE VAN | 3 |
| OSTAP ANDREI | 2 |
| OSTEN FRANS VAN | 1 |
| OSTENDORFER MARTIN MICHAEL | 1 |
| OSTERVALD AINE | 1 |
| OSTERWALD | 1 |
| OSTROWSKI LEON | 4 |
| OSWALD PAUL | 1 |
| OSZLANYI ZOLTAN | 1 |
| OTAGAWA HIKOSHIGE | 2 |
| OTELEANU LILI | 1 |
| OTESANI | 7 |
| OTETELESANU MICHAEL | 1 |
| OTETELESANU MICHAIL | 2 |
| OTETELESEANU MICHAIL OTILIA | 9 |
| OTETELISANU | 3 |
| OTOLAR CICUTHA | 2 |
| OTT IOSIF | 1 |
| OTTENS F. | 1 |
| OTTENS JOSUA | 2 |
| OTTENS R. | 1 |
| OTTERO BLAS | 1 |