Blamenco is the commander of the 6th division of the Whitebeard Pirates. His name was revealed in a SBS of Volume 58.

He is a short but muscular man with large lips and has pockets under his chin, possibly on his chest. He wears overalls adorned with a pig-looking Jolly Roger and a pirate hat with Whitebeard’s symbol on it. He dons a standard sash as a belt, tucked inside the loops of his overalls.

(Source: One Piece Wiki)