Benjamin (Hebrew: בִּנְיָמִין Bīnyāmīn; "Son of (the) right") was the last of the two sons of Jacob and Rachel (i.e., Jacob's thirteenth child and twelfth and youngest son) in Jewish, Christian and Islamic tradition. He was also the progenitor of the Israelite Tribe of Benjamin. Unlike Rachel's first son, Joseph, Benjamin was born in Canaan according to biblical narrative.
By allusion to the biblical Benjamin, in French, Polish and Spanish, "Benjamin" (benjamin/ beniamin /benjamín, respectively) is a common noun meaning the youngest child of a family, especially a particularly favored one (with a similar connotation to "baby of the family").
–Wikipedia