Son of Saba, the surname (1) of Joseph, also called Justus (Acts 1:23), some identify him with Barnabas; (2) of Judas, who was a "prophet." Nothing more is known of him than what is mentioned in Acts 15:32.
son of return; son of rest ...
Hitchcock's Bible Names Dictionary
(son of Sabas or rest). [Joseph BARSABAS; Judas BARSABAS] ...
William Smith's Bible Dictionary