In the bible Who was called "Supplanter"?

Bonus Question: How many children did this person have?

I believe it was Jacob, but don't have an answer to part II, if I'm wrong!

That's right, Now I need an answer to the bonus question.

Tough one, I know he had two wives, Leah and Rachel; Leah bore Jacob four sons, Reuben, Simeon, Levi, and Judah. Rachel, who was barren, gave her maid, Bilhah, to bear Jacob's children for her.

Thirteen: 12 sons and one daughter

From wife Rachel:

Benjamin and Joseph. Rachel died while giving birth to Benjamin.

From wife Leah:

Reuben, Simeon, Levi, Judah, Issachar, Zebulon and Dinah (the daughter).

From concubine Bilhah:

Dan and Naphtali.

From concubine Zilpah:

Gad and Asher.

Source

coldfuse, got the bonus question...Good Job!!