Bedlam originally comes from Bethlehem, but the path is indirect. In medieval London, the Hospital of St. Mary of Bethlehem was commonly shortened to Bethlem, and later people also said Bedlam.
Over time, the hospital became widely associated, often unfairly and sensationally, with noise, confusion, and mental disturbance. Because of that association, bedlam stopped being just a place name and became a common noun meaning uproar, confusion, or chaos.
That is why modern English uses the word in everyday situations that have nothing to do with the hospital or with Bethlehem itself.
- Place name: Bethlem, a short form of Bethlehem, referred to the London hospital.
- Later meaning: bedlam came to mean a scene of wild disorder.
- Example: “When the fire alarm rang during lunch, the hallway turned into bedlam.”
So the word preserves an old historical connection to Bethlehem, even though its modern meaning is all about chaos.