Sopater = "saviour of his father"
1) the son of Pyrhus of Berea, a companion of Paul
Part of Speech: noun proper masculine
From the base of G4982 and G3962; of a safe father; Sopatrus, a Christian: - Sopater. Compare G4989.
These two sites give similar information, with the definition from several dictionaries and statistics on the use of the word.
Perseus Digital Library
University of Chicago's Logion lexicon
Thayer's dictionary plus other information.
From this site's dictionary (in Italian)
Click on the first column to search for that word as a form of the root Σώπατρος; click on the second column to search for that grammatical form of the root Σώπατρος; click on the third column to search for that word and grammatical form; click on the total to search for the root Σώπατρος.