Of the sons
ben (bane)
a son (as a builder of the family name), in the widest sense (of literal and figurative relationship, including grandson, subject, nation, quality or condition, etc.
of Gershom
Gershom (gay-resh-ome')
Gereshom, the name of four Israelites -- Gershom.
Joel
Yow'el (yo-ale')
Jehovah (is his) God; Joel, the name of twelve Israelites -- Joel.
the chief
sar (sar)
a head person (of any rank or class) -- captain (that had rule), chief (captain), general, governor, keeper, lord, (-task-)master, prince(-ipal), ruler, steward.
and his brethren
'ach (awkh)
a brother (used in the widest sense of literal relationship and metaphorical affinity or resemblance (like 1) -- another, brother(-ly); kindred, like, other.
an hundred
me'ah (may-aw')
a primitive numeral; a hundred; also as a multiplicative and a fraction -- hundred(-fold), -th), + sixscore.
and thirty
shlowshiym (shel-o-sheem')
thirty; or (ordinal) thirtieth -- thirty, thirtieth.