| Olle | | - | Swedish | |
| Olof | | OL-of | Swedish | |
| Olov | | OL-ov | Swedish | |
| Orvar | | - | Swedish, Norse Mythology | |
| Oscar | | AHS-kər (English) | English, Irish, Portuguese (Brazilian), Italian, Swedish, Norwegian, Danish, Dutch, French, Irish My | |
| Oskar | | AWS-kahr (German, Polish) | Swedish, Norwegian, Danish, German, Polish | |
| Osvald | | - | Swedish, Norwegian, Danish | |
| Ottilia | | oot-TEE-lee-ah | Swedish | |
| Otto | | AW-to (German), AH-to (English), OT-to (Finnish) | German, Swedish, Norwegian, Danish, Dutch, English, Finnish, Ancient Germanic | |
| Ove | | - | Swedish, Norwegian, Danish | |
| PÅL | | - | Swedish, Norwegian | |
| Patrik | | - | Swedish, Czech, Slovak, Croatian, Hungarian | |
| Paul | | PAWL (English), POL (French), POWL (German) | English, French, German, Dutch, Swedish, Norwegian, Danish, Romanian, Biblical | |
| Paula | | POW-lah (German, Finnish, Spanish, Polish, Croatian), PAWL-ə (English), POW-lə (Portuguese), PAW-oo-law (Hungarian) | German, English, Finnish, Spanish, Portuguese, Catalan, Romanian, Hungarian, Polish, Dutch, Swedish, | |
| Paulina | | pow-LEE-nah (Spanish, Polish), paw-LEEN-ə (English) | Spanish, Portuguese, Polish, Swedish, Lithuanian, English, Ancient Roman | |