Latin octavus

← Proto-Indo-European *oḱtṓwos (inherited)

← Proto-Indo-European *oḱtṓw (mention)

← Proto-Italic *oktāwos (inherited)

← Latin octō (mention)

→ English octave (mention)

→ English Octavia (mention)

→ Norwegian Bokmål oktav (derived)

→ Dutch octaaf (derived)

→ Norwegian Nynorsk oktav (derived)