Boyd’s Bible Dictionary:
(rest). (1) Son of Zephaniah (Zech. 6:14). (2) The domestic fowl, common in Palestine, but mentioned only in Matthew 23:37; Luke 13:34.
Concise Bible Dictionary:
Son of Zephaniah (Zech. 6:14). By comparing verse 14 with Zechariah 6:10 Hen (really Chen) appears to be another name of Josiah. Some treat the word Hen not as a proper name, and translate “for the favor of the son of Zephaniah.”