There are many giant red stars much bigger than our sun! It's impossible to give you just *one* name without more context. Here are some examples to give you an idea:

* Betelgeuse: A supergiant in the constellation Orion, one of the most famous and easily visible red stars in the night sky. It's about 950 times the size of our sun.

* Antares: Another supergiant, in the constellation Scorpius, also easily visible. It's about 883 times the size of our sun.

* VY Canis Majoris: A hypergiant, one of the largest known stars. It's about 1800 times the size of our sun!

Do you have any specific criteria in mind for the giant red star you are looking for? For example,

* Is there a particular constellation you are interested in?

* Are you looking for the largest red star known?

* Are you looking for a star with specific properties, like its distance from Earth?

Knowing more about your needs will help me give you a more specific answer.