| FITO m Spanish |
| HRODULF m Ancient Germanic |
| HROLF m Ancient Germanic |
| HRÓLFR m Ancient Scandinavian |
| HRÓÐÓLFR m Ancient Scandinavian |
| RODOLF m German (Rare), Dutch (Rare) |
| RODOLFITO m Spanish |
| RODOLFO m Italian, Spanish, Portuguese |
| RODOLPH m English (Rare), French (Rare) |
| RODOLPHE m French |
| ROEL m Dutch |
| ROELOF m Dutch |
| ROFFE m Swedish |
| ROLF m German, Swedish, Norwegian, Danish, English |
| ROLLO m English |
| ROLO m English (Rare) |
| ROLPH m English (Rare) |
| ROUL m Medieval French, Medieval English |
| RUDI m German, Hungarian |
| RUDOLF m German, Dutch, Swedish, Norwegian, Danish, Polish, Czech, Hungarian, Slovene, Croatian, Russian, Armenian |
| RUDOLPH m English |
| RUDY m English |
| RUEDI m German (Swiss) |
| RUUD m Dutch |
