וַתַּ֣הַר ע֔וֹד וַתֵּ֕לֶד בִּלְהָ֖ה שִׁפְחַ֣ת רָחֵ֑ל בֵּ֥ן שֵׁנִ֖י לְיַעֲקֹֽב׃
And Bilhah Rachel’s handmaid conceived again, and bore Jacob a second son.
Targum Jonathan on Genesis
And Bilhah the handmaid of Leah conceived again and bare a second son to Jakob.