5. The name Promachus, that is, "the champion," also occurs as a surname of Heracles at Thebes (Paus. 9.11.2), and of Hermes at Tanagra (9.22.2).
[L.S]A Dictionary of Greek and Roman biography and mythology
Smith, William
A Dictionary of Greek and Roman biography and mythology. William Smith, LLD, ed. 1890