I Chronicles 6:29 Kabbalah

וּבְנֵ֧י מְרָרִ֛י אֲחֵיהֶ֖ם עַֽל־הַשְּׂמֹ֑אול אֵיתָן֙ בֶּן־קִישִׁ֔י בֶּן־עַבְדִּ֖י בֶּן־מַלּֽוּךְ׃

And on the left hand their brethren the sons of Merari: Ethan the son of Kishi, the son of Abdi, the son of Malluch;

Read kabbalistic (mystical) interpretation of I Chronicles 6:29: and classical mystical sources.