| 1 | Proto-West Germanic | balþī | boldness, strength, courage |
| 2 | Proto-Germanic | balþį̄ | boldness, strength, courage |
| 3 | Proto-Germanic | balþaz | strong, bold |
| 4 | Proto-Indo-European | bʰel- | to sound; to speak, roar, bark; shiny, white; to... |
| 5 | Proto-Indo-European | bʰōl- | — |