The story
- Proto-Italic*wre-
- Latinre-
- Proto-Indo-European*steh₂-
- Proto-Indo-European*sth₂u-ro-
- Proto-Italic*stauros
- Latin*staurō
- Latinrestaurāre
- Old Frenchrestorer
- Frenchrestaurer
- Frenchrestaurateur
- English todayrestaurateur
Borrowed from French restaurateur.
Etymology from Wiktionary, CC BY-SA 4.0.