“Wolf, garment and blood!”

When the sons of Ya‘qub set out for Egypt, Benjamin accompanied them but did not join them during meals. He also did not talk to them or mix with them. When they all reached Yusuf and saluted, he saw his brother and was delighted. When Benjamin was alone, Yusuf asked why he was sitting separately. He said, “I had a full brother and once these people took him out and did not bring him back. It was said a wolf had devoured him. I have vowed not to participate in any of their affairs until I live.”
“Are you married?” asked Yusuf.
“Yes.”
“Do you have children?”
“Yes.”
“How many?”
“Three sons.”
“What are their names?”
“Wolf, garment and blood!”
“Why have you given them such names?”
“So that I may not forget my brother. That whenever I call one of them I am reminded of my brother.”
Yusuf told the brothers to wait outside and retained Benjamin. Reference: Hayat Al-Qulub, Vol. 1, Stories of the Prophets