Why is a cot called a cot?

Can you help me understand the origin of the term 'cot' as it's used to describe a type of bed? It seems like a simple word, but I'm curious about the etymology behind it. Was it named after a specific person or place? Or is there a more functional reason for the name, perhaps related to its size, portability, or intended use? I'm eager to learn more about this intriguing piece of furniture and its linguistic roots.