You're likely thinking of triple star systems, which are systems containing three stars gravitationally bound to each other. These stars can share a common name, but their individual components are typically designated with letters (e.g., Alpha Centauri A, Alpha Centauri B, Alpha Centauri C).

Here are some examples:

* Alpha Centauri: This system consists of Alpha Centauri A, Alpha Centauri B, and Proxima Centauri (also known as Alpha Centauri C).

* Sirius: Although Sirius A and Sirius B are the most well-known components, recent research suggests a third, much fainter star, Sirius C, might be orbiting them.

* Castor: This system consists of Castor A, Castor B, Castor C, Castor D, and Castor E.

Therefore, stars themselves don't have three names. It's the triple star systems that have three components, each with its individual name.