Numbers 25:17

Now the name of the man of Israel that was slain, who was slain with the Midianite woman, was Zimri, the son of Salu, a prince of a fathers’ house among the Simeonites.

The name of the Midianite woman who was slain was Cozbi, the daughter of Zur. He was head of the people of a fathers’ house in Midian.

The LORD spoke to Moses, saying,

for they harassed you with their wiles, wherein they have deceived you in the matter of Peor, and in the incident regarding Cozbi, the daughter of the prince of Midian, their sister, who was slain on the day of the plague in the matter of Peor.”