'Mob Wives' Natalie Guercio -- Cops ID Suspect in Boyfriend's Knife Attack

The NYPD has identified the suspect who allegedly slashed the boyfriend of "Mob Wives" star Natalie Guercio early Sunday morning in a Brooklyn nightclub.

Rodolfy "Rudy" Lopez is wanted by police for the attack on London Rene. He allegedly took a box cutter to Rene's face, abdomen and arm ... then fled the scene before cops arrived.

Rene suffered a huge cut on his face and got more than 200 stitches. As TMZ first reported, Rene told police he knew the attacker. As for a motive? Rene told us on TMZ Live ... he thinks it has something to do with a longstanding "rumor" about Lopez.