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German word Kellner comes from Latin cella
cella (Latin)
A small room, a hut, barn, granary. The part of a temple where the image of a god stood; altar, sanctuary, shrine, pantry.
cellārium (Late Latin)
cellenarius (Malayalam)
kelnere (Old High German)
kelnære (Middle High German)
Kellner (German)
Waiter [from 18th c.] (male or of unspecified sex).