Jahath was the son of Libni according to verse 20.
For the spelling of the name Gershom, see the comments on 1 Chr 6.1.
Quoted with permission from Omanson, Roger L. and Ellington, John E. A Handbook on 1-2 Chronicles, Volume 1. (UBS Helps for Translators). Miami: UBS, 2014. For this and other handbooks for translators see here .