("my brother, who?" i.e. "who is my equal?".)
1. He, Sheshai, and Talmai were the three giant Anakim brothers seen by Caleb and the spies in mount Hebron (Numbers 13:22-23). The three were slain by the tribe of Judah, and the whole race was cut off by Joshua (Joshua 11:21; Judges 1:10).
2. 1 Chronicles 9:17.