The story
- Proto-Indo-European*ḱel-
- Proto-Indo-European*ḱlew-
- Proto-Indo-European*ḱlutós
- Proto-Germanic*hlūdaz
- Proto-Indo-European*ker-
- Proto-Indo-European*kóryos
- Proto-Germanic*harjaz
- Proto-Germanic*Hlūdaharjaz
- Proto-West Germanic*Hlūdhari
- Medieval LatinLōtharingus
- Medieval LatinLotharingia
- English todayLotharingia
Borrowed from Medieval Latin Lotharingia, from Lōtharingus (“a member of the dynasty or of the people of King Lothair II; a Lotharing, a Lotharian”) + Latin -ia (suffix forming country names). Doublet of Lorraine. Lothair II inherited this land from his father Lothair I upon the partition of Middle Francia. More at Chlothar.
Etymology from Wiktionary, CC BY-SA 4.0.