「波導」 (Hadō) roughly translates to "guiding wave", but may also be a pun on "a surge of water" (波動Hadō, which in itself is another way to say "wave" in Japanese). The name of "Hydro Cannon Big Bluefin" contains the kanji for the series name, explaining its relation to the rest of the series, but has a forced reading. The monsters are based on fish samurai, and named after Japanese weaponry and fresh-water fish.