The Name Captian Avatar originally gives the Yamato.
In the English-translation version of the original series released in the US, the ship was normally called the Argo. However, it was explained in the first episodes that the Argo was the resurrected sea-battleship Yamato.
(Also, the closing credits of the American version identified the original title of the Japanese series as The Space Cruiser Yamato).
The name Argo refers to a ship in ancient Greek mythology: the legend of 'Jason and the Argonauts'.