The story
- Latin · derived fromvacuum
- Dutch · derived fromvacuüm
- English todayvacuüm
From Dutch vacuüm, from Latin vacuum, the substantive neuter of the adjective vacuus (“empty”); spelt with a diæresis added to specify the trisyllabic pronunciation [ˈvæ.kjuː.əm] (as opposed to the disyllabic * [ˈvæ.kjuːm]).
Etymology from Wiktionary, CC BY-SA 4.0.