I Chronicles 7:1 Midrash

וְלִבְנֵ֣י יִשָׂשכָ֗ר תּוֹלָ֧ע וּפוּאָ֛ה ישיב [יָשׁ֥וּב] וְשִׁמְר֖וֹן אַרְבָּעָֽה׃ (ס)

And of the sons of Issachar: Tola, and Puah, Jashub, and Shimron, four.

Read midrashic interpretation of I Chronicles 7:1: and classical rabbinic exegesis.