ha.dad.rim.mon is a proper name cited as the occasion of mourning compared with Jerusalem's great mourning.

The attested use is a proper name in a comparison: Zechariah 12:11 likens Jerusalem's great mourning to mourning for this named figure or place in the valley of Megiddo.

1. Name invoked as a mourning comparison · dominant

   In Zechariah 12:11, the form is tagged as a proper noun and occurs in the clause comparing Jerusalem's great mourning with mourning for the named referent in the valley of Megiddo. The APB renders the comparison as “like the mourning for Hadad-rimmon in the valley of Megiddo.”

   Zechariah 12:11

In the Anselm Project Bible: In Zechariah 12:11, the APB presents the name in “the mourning for Hadad-rimmon”.