French châtaigne

← French castagne (doublet)

← Old French chastaigne (inherited)

← Ancient Greek κᾰ́στᾰνᾰ (derived)

← Latin castanea (inherited)

→ Catalan castanya (cognate)

→ French castagne (doublet)

→ French châtaignier (suffix)

→ French châtain (mention)

→ French châtaigneraie (suffix)

→ Irish castán (cognate)

→ Scottish Gaelic castan (cognate)

→ Manx castan (cognate)