The story
- Proto-Indo-European*steh₂-
- Proto-Indo-European*sth₂éh₁yeti
- Proto-Italic*staējō
- Proto-Italic*staēō
- Proto-Italic*staðlis?
- Latinstabili
- Old Frenchestable
- Anglo-Normanstabe
- Middle Englishstable
- Englishstable
- Latincuneus
- Old Frenchcoin
- Middle Englishcoyn
- Englishcoin
- English todaystablecoin
From stable + coin. From being backed by real-world assets whose value is stable according to various conventional ways of measuring stability.
Etymology from Wiktionary, CC BY-SA 4.0.