زَيْدٌ is one proper name but is not compound, so proper-name status alone does not make it ghayr munsarif. حَضْرَمَوْتُ has both causes taught here: proper-name status and composition.
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Why Two Causes Are Present
Cause of Ghayr Munsarif: Compound Proper Names
زَيْدٌ is one proper name but is not compound, so proper-name status alone does not make it ghayr munsarif. حَضْرَمَوْتُ has both causes taught here: proper-name status and composition.