Zaphod Beeblebrox is said to be from a planet of Betelgeuse (Alpha Orionis), which Adams used so that he could give it the comedy pronunciation "Beetlejuice"; it's definitely "Betelgeuse" in my copy of the book. Unfortunately, Betelgeuse is a variable star, so any planet in orbit around it would be either too cold to support Earth-type humanoid life-forms such as Zaphod, or too hot, or both of these at different times.