גֵּרְשֻׁנִּי Gêrᵉshunnîy (H1649)

a Gereshonite or descendant of Gereshon

Gershonite = see Geshur 1) a descendant of Gershon, firstborn son of Levi

patronymically from גֵּרְשׁוֹן (H1648);