Yes I quote,

Umibouzu (星海坊主, Umibōzu) is a renowned alien-hunter or 'Alien Buster' in the universe. His real name is Kankou (神晃, Kankō), and he is the father of Kamui and Kagura.

The nickname Umibouzu, which literally means the sea of star (galaxy) monk, is given to him in honour of his fighting prowess.