| 1 | English | Ralph | — |
| 2 | Middle English | Radulf | — |
| 3 | Old English | Rǣdwulf | — |
| 4 | Proto-Germanic | *Rādawulf | — |
| 5 | Proto-Germanic | Rēdawulfaz | — |
| 6 | Proto-Germanic | rēdaz | advice, counsel |
| 7 | Proto-Indo-European | Hréh₁dʰos | — |
| 8 | Proto-Indo-European | Hreh₁dʰ- | to think; to arrange; to succeed, accomplish |
| 9 | Proto-Indo-European | h₂reh₁- | to think, reason; to arrange |
| 10 | Proto-Indo-European | h₂er- | to fit, to fix, to put together |