The story
- Proto-Indo-European*oḱtṓw
- Proto-Italic*oktō
- Latinoctō
- LatinOctōber
- Middle High Germanoctōber
- GermanOktober
- Proto-Indo-European*dʰeh₁-
- Proto-Indo-European*dʰéh₁s
- Proto-Indo-European*dʰeh₁stos
- Proto-Italic*θēstos
- Proto-Italic*fēstos
- Latinfēstus
- Latinfestum
- Middle High Germanfëst
- GermanFest
- GermanOktoberfest
- English todayOktoberfest
Borrowed from German Oktoberfest.
Etymology from Wiktionary, CC BY-SA 4.0.