Separated, the second son of Reuben (1 Chronicles 5:3); called Phallu, Genesis 46:9. He was the father of the Phalluites (Exodus 6:14; Numbers 26:5,8).
Source: Easton's Bible Dictionary
Pallu
(distinguished ), the second son of Reuben, father of Eliab, (Isaiah 6:14; Numbers 26:5,8; 1 Chronicles 5:3) and founder of the family of Palluites.