Albert Barnes Commentary Zephaniah 1:1

"The word of Jehovah which came unto Zephaniah the son of Cushi, the son of Gedaliah, the son of Amariah, the son of Hezekiah, in the days of Josiah the son of Amon, king of Judah." — Zephaniah 1:1 (ASV)

The word of the Lord which came unto Zephaniah the son of Cushi, the son of Gedaliah, the son of Amariah, the son of Hezekiah – It seems likely that more of the prophet's forefathers are named than is the custom in Holy Scripture, because the last so named was someone remarkable. It is not impossible that Zephaniah could have been the great-grandson of King Hezekiah. For although Holy Scripture commonly names only the one son who is in the sacred line, and although he was one generation further removed from Hezekiah than Josiah was, yet if each had a son early, Zephaniah might have been contemporary with Josiah.

The names also seem to be mentioned for the sake of their meaning; at least, it is remarkable how the name of God appears in most. Zephaniah, “whom the Lord hid;” Gedaliah, “whom the Lord made great;” Amariah, “whom the Lord promised;” Hezekiah, “whom the Lord strengthened.”