Zephaniah means in the bible: The Lord is hidden. 1 The prophecy was fulfilled during the reign of Josiah, 639-608 B.C. 1:3-8; then, of universal salvation through the knowledge Jehovah 3:1-9-20. “The day of the Lord” refers to the pouring out of God’s wrath upon all things created. It falls upon Judah’s idolatries and the royal house and merchant classes as well as all the indifferent and ungodly. It also falls on all the other nations.
(in Bible Dictionary)