The story
- Proto-Indo-European*bʰel-
- Proto-Indo-European*bʰleh₁-
- Proto-Indo-European*bʰleh₁wos
- Proto-Germanic*blēwaz
- Proto-West Germanic*blā
- Late Latinblāvus
- Anglo-Normanble
- Middle Englishblew
- Englishblue
- Englishblues
- English todaybluesy
Etymology from Wiktionary, CC BY-SA 4.0.