I Chronicles 6:2 Kabbalah

וְאֵ֛לֶּה שְׁמ֥וֹת בְּֽנֵי־גֵרְשׁ֖וֹם לִבְנִ֥י וְשִׁמְעִֽי׃

And these are the names of the sons of Gershom: Libni, and Shimei.

Read kabbalistic (mystical) interpretation of I Chronicles 6:2: and classical mystical sources.