Sarquiss

Japanese name:	サーキース
Nickname:	Big Knife

The First Mate of Bellamy the Hyena, Sarquiss (サーキース, Sākīsu) with a bounty of 38,000,000 for his head. He is nick-named 'Big Knife', due to his large dagger (it bears a strong resemblance to a massive kukri).

http://onepiece.wikia.com/wiki/Sarquiss