Midrash for II Chronicles 3:17

וַיָּ֤קֶם אֶת־הָֽעַמּוּדִים֙ עַל־פְּנֵ֣י הַהֵיכָ֔ל אֶחָ֥ד מִיָּמִ֖ין וְאֶחָ֣ד מֵֽהַשְּׂמֹ֑אול וַיִּקְרָ֤א שֵׁם־הימיני [הַיְמָנִי֙] יָכִ֔ין וְשֵׁ֥ם הַשְּׂמָאלִ֖י בֹּֽעַז׃ (ס)

And he set up the pillars before the temple, one on the right hand, and the other on the left; and called the name of that on the right hand Jachin, and the name of that on the left Boaz.

Bamidbar Rabbah