three. In Genesis 46:21 there were ten. When Chronicles was written the others probably had become extinct. Even in Numbers 26:38 only five are mentioned. in 1 Chronicles 8:1; 1 Chronicles 8:2 only five are given.
Related Commentaries of 1 Chronicles 7:6
1 Chronicles 7:6
6 The sons of Benjamin; Bela, and Becher, and Jediael, three.